Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
apache/apisix		pinDigest	→ 468a384
digitalcredentials/issuer-coordinator		pinDigest	→ 8610376
digitalcredentials/signing-service		pinDigest	→ 2a2e2fe
ghcr.io/astral-sh/uv	stage	pinDigest	→ 440fd64
postgres	service	pinDigest	→ 2bc89ee
postgres		pinDigest	→ 2bc89ee
python	stage	pinDigest	→ a3ab0b9
quay.io/keycloak/keycloak		pinDigest	→ 5afd404
varnish		pinDigest	→ 2af8792

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