Bump version for v1.16.121 release #433

Job	Run time
Run test and build (macos-14, aarch64-apple-darwin)	52s
Run test and build (macos-15-intel, x86_64-apple-darwin)	2m 23s
Run test and build (windows-latest, x86_64-pc-windows-msvc)	1m 54s
Run test and build (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	53s
Run test and build (macos-15, aarch64-apple-darwin)	1m 0s
Run test and build (ubuntu-latest, x86_64-unknown-linux-gnu)	1m 2s
	8m 4s

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