Merge pull request #31541 from hsbt/fix-travis-failure

Temporary disabled using rubygems 2.7.

.travis.yml

@@ -28,7 +28,7 @@ addons:
 bundler_args: --without test --jobs 3 --retry 3
 before_install:
   - "rm ${BUNDLE_GEMFILE}.lock"
-  - "travis_retry gem update --system"
+  - "travis_retry gem update --system 2.6.14"
   - "travis_retry gem install bundler -v 1.15.4"
   - "[ -f /tmp/beanstalkd-1.10/Makefile ] || (curl -L https://github.com/kr/beanstalkd/archive/v1.10.tar.gz | tar xz -C /tmp)"
   - "pushd /tmp/beanstalkd-1.10 && make && (./beanstalkd &); popd"