canary: bump golang from 1.21.3 to 1.21.4 in /dependabot/docker/go #145

Job	Run time
CI matrix / Assert PR branch is ahead	5s
Makefile / Assert PR branch is ahead	5s
CI matrix / Lint codebase (go-ci-oldstable, false)	49s
CI matrix / Build codebase (go-ci-oldstable, false)	30s
CI matrix / Lint codebase (go-ci-stable, false)	40s
CI matrix / Run tests (go-ci-oldstable, false)	26s
CI matrix / Build codebase (go-ci-stable, false)	50s
CI matrix / Lint codebase (go-ci-unstable, true)	30s
CI matrix / Run tests (go-ci-stable, false)	39s
Makefile / Build codebase using Makefile all recipe	0s
CI matrix / Build codebase (go-ci-unstable, true)	25s
CI matrix / Run tests (go-ci-unstable, true)	34s
Makefile / Build codebase using Makefile quick recipe	29s
Makefile / Lint codebase using Makefile	0s
CI matrix / Optional Linting / Assert PR branch is ahead	4s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-oldstable, true)	48s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-stable, true)	29s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-unstable, true)	28s
	7m 51s

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