fix: update tests to work with breaking changes in recent synapse versions

[FrenchGithubUser]

fix: update tests to work with breaking changes in recent synapse
versions

• Clock moved from synapse.util to synapse.util.clock
• Clock.__init__ now requires a server_name argument to support
  easier metric setups and multi-tenancy
• LoggingDatabaseConnection.__inti__ now uses keyword-only arguments,
  and requires server_name
• HomeServer.__init__ no long accepts version_string argument

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.08%. Comparing base (3766167) to head (29de5c4).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #73   +/-   ##
=======================================
  Coverage   83.08%   83.08%           
=======================================
  Files          18       18           
  Lines        1874     1874           
  Branches      193      193           
=======================================
  Hits         1557     1557           
  Misses        234      234           
  Partials       83       83           

Files with missing lines	Coverage Δ
tests/__init__.py	89.56% <100.00%> (ø)
tests/server.py	78.65% <100.00%> (ø)
tests/unittest.py	86.41% <100.00%> (ø)

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