Update balena/open-balena-base Docker tag to v18.0.21 #879

Job	Run time
Flowzone / Event Types (pull_request, opened)	7s
Flowzone / octoscan	18s
Flowzone / File list	2s
Flowzone / Clean GitHub release	0s
Flowzone / actionlint	9s
Flowzone / Versioned source	34s
Flowzone / Pre-commit hooks	0s
Flowzone / Is custom	5s
Flowzone / Is rust	6s
Flowzone / Is CloudFormation	0s
Flowzone / Is balena	0s
Flowzone / Is docker	11s
Flowzone / Is npm	10s
Flowzone / Is python	8s
Flowzone / Is website	0s
Flowzone / Generate release notes	6s
Flowzone / Finalize CloudFormation	0s
Flowzone / Test CloudFormation	0s
Flowzone / Test custom	0s
Flowzone / Finalize custom	0s
Flowzone / Clean custom	0s
Flowzone / Test rust	0s
Flowzone / Finalize rust	0s
Flowzone / Finalize GitHub release	0s
Flowzone / Generate SBOM for cargo	0s
Flowzone / Finalize balena	0s
Flowzone / Prepare deploy message	0s
Flowzone / Finalize npm docs	0s
Flowzone / Test npm (22.x)	27s
Flowzone / Finalize npm	0s
Flowzone / Finalize python	0s
Flowzone / Test python poetry	0s
Flowzone / Generate SBOM for python	0s
Flowzone / Test docker (default, linux/amd64, ubuntu-22.04, amd64, default)	2m 5s
Flowzone / Finalize docker	0s
Flowzone / Generate SBOM for NPM	36s
Flowzone / All tests	1s
Flowzone / Publish custom	0s
Flowzone / Publish rust	0s
Flowzone / Publish balena	0s
Flowzone / Publish docker (balena/balena-mdns-publisher, default, default, amd64)	44s
Flowzone / Publish npm	0s
Flowzone / Publish website	0s
Flowzone / Publish to test PyPI	0s
Flowzone / Publish Github release	7s
Flowzone / Always custom	0s
Flowzone / All jobs	1s
Flowzone / Auto-merge	0s
	5m 57s

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