ci: install protoc for release builds #281

Job	Run time
release	16s
build (macos-latest, aarch64-apple-darwin)	27m 34s
build (macos-latest, x86_64-apple-darwin)	27m 46s
build (windows-latest, x86_64-pc-windows-msvc)	51m 30s
build (ubuntu-24.04, x86_64-unknown-linux-gnu)	58m 2s
	2h 45m 8s

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