Fix gcc + clang warnings #1437

Job	Run time
bindings	25m 28s
build (clang-sanitize, ubuntu-22.04)	1h 22m 11s
build (gcc-release, ubuntu-22.04)	19m 9s
build (gcc-10-release, ubuntu-22.04)	22m 5s
build (gcc-debug-shared, ubuntu-22.04)	12m 30s
build (gcc-debug-noexcept, ubuntu-22.04)	13m 15s
build (macos-release, macos-13)	6m 33s
build (win64-release, windows-latest)	23m 47s
build (win64-debug-shared, windows-latest)	34m 55s
build (win64-debug-noexcept, windows-latest)	38m 27s
conan	12m 57s
linux-coverage	19m 12s
	5h 10m 29s

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