feat(github-releases): getDigest() (#10947)

jest.config.ts

lib/datasource/github-releases/common.spec.ts

lib/datasource/github-releases/common.ts

lib/datasource/github-releases/digest.spec.ts

lib/datasource/github-releases/digest.ts

lib/datasource/github-releases/index.spec.ts

lib/datasource/github-releases/index.ts

lib/datasource/github-releases/test/index.ts

lib/datasource/github-releases/types.ts

lib/datasource/index.ts

lib/datasource/types.ts

tsconfig.app.json