refactor(lint): Fix some unsafe returns for datasources (#7363)

lib/datasource/crate/index.ts

lib/datasource/docker/index.ts

lib/datasource/github-tags/index.ts

lib/datasource/helm/index.ts

lib/datasource/index.ts

lib/datasource/maven/index.spec.ts

lib/datasource/maven/util.ts

lib/datasource/npm/get.ts

lib/datasource/packagist/index.ts