bump golang to version v1.21.6

[glours]

What I did
Bump Golang to version v1.21.6

go1.21.6 (released 2024-01-09) includes fixes to the compiler, the runtime, and the crypto/tls, maps, and runtime/pprof packages. See the Go 1.21.6 milestone on our issue tracker for details.

Related issue

(not mandatory) A picture of a cute animal, if possible in relation to what you did

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2bf2b22) 56.74% compared to head (8767474) 56.61%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11331      +/-   ##
==========================================
- Coverage   56.74%   56.61%   -0.14%     
==========================================
  Files         134      134              
  Lines       11448    11448              
==========================================
- Hits         6496     6481      -15     
- Misses       4330     4342      +12     
- Partials      622      625       +3     

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[milas]

👍🏻

[thaJeztah]

Not for this PR, but there's newer versions of xx (v1.3.0) and GolangCI-lint (v1.55.2) that we may want to update as well.

For xx; I'm running into an issue when cross-compiling in docker/docker-credential-helpers#310, so just a heads-up on that.

[milas]

Thanks for the heads up, I'll open a couple new PRs for these

[milas]

golangci-lint PR @ #11332

Following the xx discussion, same issue on Compose side:

 > [linux/arm64->darwin/amd64 build 1/1] RUN --mount=type=bind,target=.     --mount=type=cache,target=/root/.cache     --mount=type=cache,target=/go/pkg/mod     --mount=type=bind,from=osxcross,src=/osxsdk,target=/xx-sdk     xx-go --wrap &&     if [ "$(xx-info os)" == "darwin" ]; then export CGO_ENABLED=1; fi &&     make build GO_BUILDTAGS="e2e" DESTDIR=/out &&     xx-verify --static /out/docker-compose:
1.355 GO111MODULE=on go build  -trimpath -tags "e2e" -ldflags "-w -X github.com/docker/compose/v2/internal.Version=v2.24.0-birthday.10-39-gf5c53c2d0.m" -o "/out/docker-compose" ./cmd
201.4 # github.com/docker/compose/v2/cmd
201.4 /usr/local/go/pkg/tool/linux_arm64/link: running x86_64-apple-macos10.6-clang failed: exit status 1
201.4 /usr/bin/x86_64-apple-macos10.6-ld: line 9: sigtool-gensig: not found
201.4 clang: error: unable to execute command: No such file or directory
201.4 clang: error: linker command failed due to signal (use -v to see invocation)
201.4

[thaJeztah]

Thanks for checking! /cc @crazy-max

[thaJeztah]

LGTM