docker: bump atc0005/go-ci from go-ci-unstable-build-v0.13.7 to go-ci-unstable-build-v0.13.8 in /dependabot/docker/builds #190

Job	Run time
CI matrix / Assert PR branch is ahead	7s
Makefile / Assert PR branch is ahead	7s
CI matrix / Lint codebase (go-ci-oldstable, false)	48s
CI matrix / Lint codebase (go-ci-stable, false)	48s
CI matrix / Lint codebase (go-ci-unstable, true)	47s
CI matrix / Build codebase (go-ci-oldstable, false)	39s
CI matrix / Build codebase (go-ci-stable, false)	40s
CI matrix / Build codebase (go-ci-unstable, true)	45s
CI matrix / Run tests (go-ci-oldstable, false)	38s
CI matrix / Run tests (go-ci-stable, false)	43s
CI matrix / Run tests (go-ci-unstable, true)	42s
CI matrix / Optional Linting / Assert PR branch is ahead	7s
Makefile / Build codebase using Makefile quick recipe	42s
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)	38s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-stable, true)	46s
CI matrix / Optional Linting / Lint codebase using optional linters (go-ci-unstable, true)	45s
	9m 42s

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