libstdc++: Ensure that std::vector<bool> allocator has bool value_type

This is the subject of LWG 4228 which notes that libstdc++ doesn't
enforce this requirement. That's just a bug because I forgot to add it
to vector<bool> when adding it elsewhere.

For consistency with the other containers we should not allow incorrect
allocator types for strict -std=c++NN modes, but it is very late to make
that change for GCC 15 so this only enables the assertion for C++20
(where it's required). For GCC 16 we can enable it for strict modes too.

libstdc++-v3/ChangeLog:

	* include/bits/stl_bvector.h (vector<bool, A>): Enforce the
	C++20 requirement that the allocator's value_type matches the
	container.
	* testsuite/23_containers/vector/bool/cons/from_range.cc: Fix
	incorrect allocator type.

Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>

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