Pin dependencies

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This PR contains the following updates:

Package	Type	Update	Change
apache/apisix		pinDigest	→ 4f58c40
digitalcredentials/issuer-coordinator		pinDigest	→ 8610376
digitalcredentials/signing-service		pinDigest	→ 2a2e2fe
postgres (source)	service	pinDigest	→ 2bc89ee
postgres (source)		pinDigest	→ 2bc89ee
quay.io/keycloak/keycloak		pinDigest	→ b0f60d4
varnish		pinDigest	→ 842a287

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