Update golang

Changes:

- docker-library/golang@377e297: Merge pull request docker-library/golang#491 from infosiftr/gotoolchain
- docker-library/golang@b643595: Set `GOTOOLCHAIN` to prevent go auto-upgrade

Author: docker-library-bot

library/golang

@@ -8,22 +8,22 @@ GitRepo: https://github.com/docker-library/golang.git
 Tags: 1.21.1-bookworm, 1.21-bookworm, 1-bookworm, bookworm
 SharedTags: 1.21.1, 1.21, 1, latest
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
-GitCommit: 585c8c1e705a7a458455f0629922a4f90628ce08
+GitCommit: b643595f97209e0e67f0cf62e13d4fb6c609451b
 Directory: 1.21/bookworm
 
 Tags: 1.21.1-bullseye, 1.21-bullseye, 1-bullseye, bullseye
 Architectures: amd64, arm32v5, arm32v7, arm64v8, i386, mips64le, ppc64le, s390x
-GitCommit: 585c8c1e705a7a458455f0629922a4f90628ce08
+GitCommit: b643595f97209e0e67f0cf62e13d4fb6c609451b
 Directory: 1.21/bullseye
 
 Tags: 1.21.1-alpine3.18, 1.21-alpine3.18, 1-alpine3.18, alpine3.18, 1.21.1-alpine, 1.21-alpine, 1-alpine, alpine
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 585c8c1e705a7a458455f0629922a4f90628ce08
+GitCommit: b643595f97209e0e67f0cf62e13d4fb6c609451b
 Directory: 1.21/alpine3.18
 
 Tags: 1.21.1-alpine3.17, 1.21-alpine3.17, 1-alpine3.17, alpine3.17
 Architectures: amd64, arm32v6, arm32v7, arm64v8, i386, ppc64le, s390x
-GitCommit: 585c8c1e705a7a458455f0629922a4f90628ce08
+GitCommit: b643595f97209e0e67f0cf62e13d4fb6c609451b
 Directory: 1.21/alpine3.17
 
 Tags: 1.21.1-windowsservercore-ltsc2022, 1.21-windowsservercore-ltsc2022, 1-windowsservercore-ltsc2022, windowsservercore-ltsc2022