wrong git tag for v0.12.0

[Felix Schröter]

Describe the bug

I just realised that the git tag for GitHub release v0.12.0 is v0.11.1:
https://github.com/bufbuild/connect-es/releases/tag/v0.11.1

[Timo Stamm]

Thanks for the shout, @felschr. The tag pointed to the right commit, but was named incorrectly. Fixed up: https://github.com/bufbuild/connect-es/releases/tag/v0.12.0