get_module_functions: gc protect CppFunctionInfo struct during push_back #17

Job	Run time
Julia 1.6 - ubuntu-latest - x64	6m 52s
Julia 1.6 - macos-13 - x64	16m 50s
Julia 1.10 - ubuntu-latest - x64	6m 59s
Julia 1.10 - macos-13 - x64	18m 51s
Julia nightly - ubuntu-latest - x64	7m 4s
Julia nightly - macos-13 - x64	19m 39s
Julia 1.10 - macos-14 - aarch64	8m 49s
Julia nightly - macos-14 - aarch64	8m 50s
	1h 33m 54s

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