[updatecli] Bump Golang version to 1.21.0

[updateclibot]

Bump Golang Version

[release.yaml] Update Golang version to 1.21.0

key "$.jobs.build.steps[0].with.go-version" updated from "1.20.7" to "1.21.0", in file ".github/workflows/go.yaml"

1.21.0

Golang changelog for version "1.21.0" is available on "https://go.dev/doc/go1.21"

Update Golang version to 1.21.0

go.mod updated Golang version from "1.20" to "1.21"

1.21.0

Golang changelog for version "1.21.0" is available on "https://go.dev/doc/go1.21"

[release.yaml] Update Golang version to 1.21.0

key "$.jobs.build.steps[3].with.go-version" updated from "1.20.7" to "1.21.0", in file ".github/workflows/release.yaml"

1.21.0

Golang changelog for version "1.21.0" is available on "https://go.dev/doc/go1.21"

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