Convert "latest" to version string #26

Job	Run time
Lint / Lint shell scripts	13s
Test / Feature actionlint	59s
Test / Feature actionlint » debian:latest	22s
Test / Feature google-cloud-cli	1m 58s
Lint / Validate devcontainer-feature.json files	6s
Test / Feature actionlint » ubuntu:latest	23s
Test / Feature postgresql-client	33s
Test / Feature actionlint » mcr.microsoft.com/devcontainers/base:ubuntu	30s
Test / Feature shellcheck	42s
Test / Feature google-cloud-cli » debian:latest	57s
Test / Feature google-cloud-cli » ubuntu:latest	1m 9s
Test / Feature google-cloud-cli » mcr.microsoft.com/devcontainers/base:ubuntu	1m 26s
Test / Feature postgresql-client » debian:latest	17s
Test / Feature postgresql-client » ubuntu:latest	30s
Test / Feature postgresql-client » mcr.microsoft.com/devcontainers/base:ubuntu	28s
Test / Feature shellcheck » debian:latest	41s
Test / Feature shellcheck » ubuntu:latest	17s
Test / Feature shellcheck » mcr.microsoft.com/devcontainers/base:ubuntu	39s
Publish to GitHub Packages	11s
	12m 21s

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