feat(internal): fixedRegistries (#9124)

lib/datasource/cdnjs/index.ts

lib/datasource/dart/index.ts

lib/datasource/galaxy/index.ts

lib/datasource/git-refs/index.ts

lib/datasource/git-tags/index.ts

lib/datasource/go/index.ts

lib/datasource/hex/index.ts

lib/datasource/index.spec.ts

lib/datasource/index.ts

lib/datasource/npm/index.ts

lib/datasource/orb/index.ts

lib/datasource/repology/index.ts

lib/datasource/ruby-version/index.ts

lib/datasource/types.ts