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Update to go1.21 in Dockerfile.rootless (#332)

Follow #330

Fix https://gitea.com/gitea/act_runner/pulls/330#issuecomment-747099

Reviewed-on: https://gitea.com/gitea/act_runner/pulls/332
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Reviewed-by: appleboy <appleboy.tw@gmail.com>
Co-authored-by: Jason Song <i@wolfogre.com>
Co-committed-by: Jason Song <i@wolfogre.com>
This commit was merged in pull request #332.
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-528-ga5a645824f