Fix Python 3.15 stubtest guards

Author: JelleZijlstra

stdlib/@tests/stubtest_allowlists/darwin-py315.txt

@@ -1,16 +1,12 @@
-_decimal.SPEC_VERSION
 _pyrepl.fancy_termios
 _pyrepl.unix_console
 _pyrepl.unix_eventqueue
 ctypes.c_double_complex._type_
 ctypes.c_float_complex._type_
 ctypes.c_longdouble_complex._type_
-decimal.SPEC_VERSION
 mmap.MS_ASYNC
 mmap.MS_INVALIDATE
 mmap.MS_SYNC
-mmap.mmap.madvise
-mmap.mmap.resize
 os.NODEV
 os.__all__
 posix.NODEV
@@ -21,5 +17,3 @@ profiling.sampling.live_collector.display
 profiling.sampling.live_collector.trend_tracker
 profiling.sampling.live_collector.widgets
 readline.get_pre_input_hook
-resource.RLIM_SAVED_CUR
-resource.RLIM_SAVED_MAX