refactor(datasource): Fix lint warnings (#7115)

lib/datasource/common.ts

lib/datasource/docker/index.spec.ts

lib/datasource/docker/index.ts

lib/datasource/galaxy/index.ts

lib/datasource/index.ts

lib/datasource/npm/get.ts

lib/datasource/npm/npmrc.ts

lib/datasource/nuget/v3.ts

lib/datasource/pypi/index.ts

lib/datasource/repology/index.spec.ts

lib/datasource/rubygems/get-rubygems-org.ts