Upgrade deprecated modules

[fkrause98]

How to replicate

1. Place yourself at the root of the project.
2. Make sure you're using Erlang 27.
3. Run make test PROFILE=travis (maybe you'll have to run this differently If the CI update is merged by then).
4. You should see a lot of warnings:

===> Compiling ranch
_build/default/lib/ranch/src/ranch_ssl.erl:128:7: Warning: ssl:ssl_accept/2 is removed; use ssl_handshake/1,2,3 instead
_build/default/lib/ranch/src/ranch_ssl.erl:233:9: Warning: ssl:cipher_suites/0 is removed; use cipher_suites/2,3 instead
_build/default/lib/ranch/src/ranch_ssl.erl:235:4: Warning: ssl:cipher_suites/0 is removed; use cipher_suites/2,3 instead

===> Compiling cowlib
===> Compiling gun
_build/default/lib/gun/src/gun.erl:533:29: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace

===> Compiling jsx
===> Compiling cowboy
_build/default/lib/cowboy/src/cowboy_handler.erl:47:31: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace

_build/default/lib/cowboy/src/cowboy_loop.erl:68:31: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace

_build/default/lib/cowboy/src/cowboy_stream_h.erl:230:17: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_stream_h.erl:235:17: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_stream_h.erl:239:32: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace

_build/default/lib/cowboy/src/cowboy_req.erl:205:6: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_req.erl:396:6: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_req.erl:496:8: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_req.erl:549:6: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace

_build/default/lib/cowboy/src/cowboy_websocket.erl:379:31: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace

_build/default/lib/cowboy/src/cowboy_rest.erl:1213:30: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace

_build/default/lib/cowboy/src/cowboy_http2.erl:342:24: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_http2.erl:506:24: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_http2.erl:1018:22: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_http2.erl:1040:22: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_http2.erl:1120:22: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace

_build/default/lib/cowboy/src/cowboy_http.erl:289:22: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_http.erl:306:22: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_http.erl:803:24: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_http.erl:1117:22: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace
_build/default/lib/cowboy/src/cowboy_http.erl:1203:22: Warning: erlang:get_stacktrace/0 is removed; use the new try/catch syntax for retrieving the stack backtrace

===> Analyzing applications...
===> Compiling shortly
solution/shortly_syn.erl:19:5: Warning: pg2:leave/2 is removed; this module was removed in OTP 24. Use 'pg' instead

solution/shortly_notification_pg2.erl:13:5: Warning: pg2:create/1 is removed; this module was removed in OTP 24. Use 'pg' instead
solution/shortly_notification_pg2.erl:16:5: Warning: pg2:join/2 is removed; this module was removed in OTP 24. Use 'pg' instead
solution/shortly_notification_pg2.erl:19:5: Warning: pg2:leave/2 is removed; this module was removed in OTP 24. Use 'pg' instead
solution/shortly_notification_pg2.erl:22:12: Warning: pg2:get_members/1 is removed; this module was removed in OTP 24. Use 'pg' instead

test/shortly_shortener_SUITE.erl:102:15: Warning: http_uri:encode/1 is deprecated and will be removed in OTP 26; use uri_string:quote function instead

Fix

On the surface level, the fixes seem to be mostly version bumps and replace old functions with their new equivalents.
So I suggest doing this on a single PR/Issue, if it gets messy, we should split this into a bunch of issues tracking each one.