chore(deps): update angularmaterial monorepo to v21.2.14 #240

Job	Run time
release-please	20s
documentation / build	2m 17s
build-and-push (frontend, frontend/Dockerfile, ., frontend) / upload-to-ghcr	1m 3s
build-and-push (backend, backend/Dockerfile, ., backend) / upload-to-ghcr	1m 12s
documentation / deploy	18s
	5m 10s

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