These test failures first appeared on irrelevant changes. It probably
came from changes in GitHub Actions instead of CRuby's.

Until we figure out how to fix these tests, let's skip them to make the
CI usable.

	[Bug #20853] Fix Proc#hash to not change after compaction

	The hash value of a Proc must remain constant after a compaction, otherwise
	it may not work as the key in a hash table.

	Fix method caching bug when including/prepend module A that prepends module B

	Fix by always adding the generated iclass to the subclasses list,
	otherwise the method cache for the iclass is not cleared when
	the method in the module is overwritten.

	Fixes [Bug #20716]

	[Bug #20755] Frozen string should not be writable via IO::Buffer

	[Bug #20752] Slice of readonly `IO::Buffer` also should be readonly

	[Bug #20719] `Float` argument must be ASCII compatible

	[Bug #20704] Win32: Fix chdir to non-ASCII path

	On Windows, `chdir` in compilers' runtime libraries uses the active
	code page, but command line arguments in ruby are always UTF-8, since
	commit:33ea2646b98adb49ae2e1781753bf22d33729ac0.

	Refactor RUBY_DESCRIPTION assertions in test_rubyoptions