Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/setup-node	action	pinDigest	→ 27082ce
apache/apisix		pinDigest	→ 468a384
digitalcredentials/issuer-coordinator		pinDigest	→ 8610376
digitalcredentials/signing-service		pinDigest	→ 2a2e2fe
ghcr.io/astral-sh/uv	stage	pinDigest	→ bca7f69
mitodl/ol-github-workflows	action	pinDigest	→ edd566d
nginx	final	pinDigest	→ 6e23479
postgres	service	pinDigest	→ 2bc89ee
postgres		pinDigest	→ 2bc89ee
python	stage	pinDigest	→ 6d85378
quay.io/keycloak/keycloak		pinDigest	→ 26ae264
redis	service	pinDigest	→ 7b6fb55
redis		pinDigest	→ 7b6fb55
varnish		pinDigest	→ f0608bc

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