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src,doc: fix alpha tag on non-alpha releases #11724

Job	Run time
Build slim tarball	1m 21s
aarch64-linux: Cache V8 build	18s
aarch64-darwin: with shared libraries / build	28m 28s
x86_64-darwin: with shared libraries / build	37m 19s
x86_64-linux: with shared libraries and perfetto / build	33m 40s
aarch64-linux: with shared openssl-3.6.3 / build	30m 3s
aarch64-linux: with shared openssl-3.5.7 / build	30m 9s
aarch64-linux: with shared openssl-fips-3.5.7 / build	35m 34s
aarch64-linux: with shared boringssl-0.20260803.0 / build	30m 3s
aarch64-linux: with shared openssl-3.0.21 / build	30m 22s
aarch64-linux: with shared openssl-4.0.1 / build	29m 38s
	4h 46m 55s