Deallocate m_mem only if not nullptr #13
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This PR - replaces `boost::container::pmr` classes with `std::pmr` as both Clang and GCC support it. - pushes the minimum supported GCC version from 11 to 13.2 as GCC supports `std::pmr` in version >= 13.2. - Updates `compact_vector` to v0.1.3 as it [tried to deallocate memory](https://github.com/gmarcais/compact_vector/blob/9d5b66a4564582911780a9485765f61c74b95a4c/include/compact_vector.hpp#L98) for a given [nulltpr after using the move constructor](https://github.com/gmarcais/compact_vector/blob/9d5b66a4564582911780a9485765f61c74b95a4c/include/compact_vector.hpp#L74). This is [undefined behavior when called on a memory resource](https://en.cppreference.com/w/cpp/memory/memory_resource/deallocate). Related to gmarcais/compact_vector#13 ---------
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The deconstructor tries to deallocate memory for a given nulltpr if the move constructor has been used before. If the allocator is an
std::pmr::polymorphic_allocator, the memory resource'sdeallocatefunction will be called with a nullptr. This is undefined behavior.This PR adds a simple check so that the deconstructor only deallocates
m_memif it is notnullptr.