Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	pinDigest	→ 93cb6ef
actions/setup-java	action	pinDigest	→ c1e3236
actions/upload-artifact	action	pinDigest	→ ea165f8
alpine	stage	pinDigest	→ 28bd5fe
docker.io/xenit/openjdk	final	pinDigest	→ d49df9f
docker.io/xenit/postgres		pinDigest	→ d9c3e2a
gradle/gradle-build-action	action	pinDigest	→ ac2d340
localstack/localstack		pinDigest	→ c396d89

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