Remove experimental notices for Nexus (#1381) #635

Job	Run time
compile-binaries (ubuntu-latest, linux-amd64)	7m 7s
compile-binaries (windows-latest, windows-amd64)	11m 0s
compile-binaries (macos-arm, macos-aarch64, macos-14)	7m 17s
compile-binaries (ubuntu-arm, linux-aarch64, ubuntu-24.04-arm64-2-core)	8m 20s
compile-binaries (macos-intel, macos-amd64, macos-15-intel)	10m 58s
	44m 42s

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