Fix build warnings #2209

Job	Run time
linux-coverage	15m 1s
bindings	16m 48s
conan	8m 35s
build (clang-sanitize, ubuntu-latest)	42m 48s
build (gcc-release, ubuntu-latest)	9m 7s
build (gcc-11-release, ubuntu-latest)	9m 4s
build (gcc-debug-shared, ubuntu-latest)	8m 15s
build (gcc-debug-noexcept, ubuntu-latest)	8m 35s
build (macos-release, macos-latest)	5m 20s
build (win64-release, windows-latest)	12m 56s
build (win64-debug-shared, windows-latest)	11m 4s
build (win64-debug-noexcept, windows-latest)	9m 54s
	2h 37m 27s

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