canary: bump golang from 1.21.3 to 1.21.4 in /dependabot/docker/go #294

Job	Run time
CI matrix / Assert PR branch is ahead	7s
Makefile / Assert PR branch is ahead	5s
Makefile / Build codebase using Makefile quick recipe	1m 27s
Makefile / Lint codebase using Makefile	0s
Makefile / Build codebase using Makefile all recipe	0s
CI matrix / Build codebase (go-ci-oldstable, false)	41s
CI matrix / Build codebase (go-ci-stable, false)	44s
CI matrix / Run tests (go-ci-oldstable, false)	1m 46s
CI matrix / Lint codebase (go-ci-oldstable, false)	50s
CI matrix / Run tests (go-ci-stable, false)	1m 25s
CI matrix / Lint codebase (go-ci-stable, false)	1m 36s
CI matrix / Run tests (go-ci-unstable, true)	1m 20s
CI matrix / Build codebase (go-ci-unstable, true)	1m 14s
CI matrix / Lint codebase (go-ci-unstable, true)	1m 6s
CI matrix / Optional Linting / Assert PR branch is ahead	6s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-oldstable, true)	1m 6s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-stable, true)	44s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-unstable, true)	1m 21s
	15m 38s

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