[renovate]

This PR contains the following updates:

Package	Update	Change
quay.io/coreos/etcd	minor	v3.5.21 → v3.7.3

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[t8y2]

This PR fails the database-environments check: deploy/database/etcd/3.5/recipe.json still pins quay.io/coreos/etcd:v3.5.21, and the validator requires the compose image to match recipe.image (FAIL etcd/3.5: compose.yaml image must match recipe.image). More importantly, this fixture exists specifically to provide an etcd 3.5 environment — a separate deploy/database/etcd/3.7 environment (currently v3.7.0 via the cnb mirror) already covers 3.7.x, and both are documented in docs/content/docs/database-lab.mdx. Bumping the 3.5 compose to v3.7.3 would drop etcd 3.5 coverage entirely and leave the directory name, dbx-etcd-3.5 container name, and docs inconsistent. Please close this PR and constrain renovate to 3.5.x for this fixture; if etcd 3.7.3 is desired, update the etcd/3.7 environment (recipe.json + compose.yaml together) instead.