Go Runtime: Bump golang from 1.21.8 to 1.21.9 in /dependabot/docker/go #411

Job	Run time
CI matrix / Assert PR branch is ahead	4s
Makefile / Assert PR branch is ahead	4s
CI matrix / Evaluate loopvar scoping changes	44s
CI matrix / Run tests (go-ci-oldstable, false)	48s
CI matrix / Lint codebase (go-ci-oldstable, false)	54s
CI matrix / Run tests (go-ci-stable, false)	38s
CI matrix / Build codebase (go-ci-oldstable, false)	38s
CI matrix / Lint codebase (go-ci-stable, false)	46s
CI matrix / Run tests (go-ci-unstable, true)	41s
CI matrix / Build codebase (go-ci-stable, false)	41s
CI matrix / Lint codebase (go-ci-unstable, true)	40s
CI matrix / Build codebase (go-ci-unstable, true)	42s
CI matrix / Optional Linting / Assert PR branch is ahead	4s
Makefile / Build codebase using Makefile quick recipe	57s
Makefile / Lint codebase using Makefile	0s
Makefile / Build codebase using Makefile all recipe	0s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-oldstable, true)	36s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-stable, true)	41s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-unstable, true)	39s
	10m 17s

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