refactor: remove unnecessary catch code in datasources (#6583)

lib/datasource/cdnjs/index.ts

lib/datasource/crate/index.ts

lib/datasource/dart/index.ts

lib/datasource/docker/index.ts

lib/datasource/galaxy/index.ts

lib/datasource/git-refs/index.ts

lib/datasource/git-submodules/index.ts

lib/datasource/github-releases/index.ts

lib/datasource/github-tags/index.ts

lib/datasource/gitlab-tags/index.ts

lib/datasource/go/index.ts

lib/datasource/gradle-version/index.ts

lib/datasource/helm/index.ts

lib/datasource/hex/index.ts

lib/datasource/index.ts

lib/datasource/maven/index.ts

lib/datasource/nuget/v2.ts

lib/datasource/nuget/v3.ts

lib/datasource/orb/index.ts

lib/datasource/packagist/index.ts