Fix using the single threaded RTS

Passed in 6m 24s
:pipeline:curl -sS "https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?$(date +%s)" -o bazelci.py && python3.6 bazelci.py project_pipeline --file_config=.bazelci/presubmit.yml | tee /dev/tty | buildkite-agent pipeline upload
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Ran in 7s
:ubuntu: Ubuntu 18.04 LTS (OpenJDK 11, gcc 7.5.0)curl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1717074795 -o bazelci.py && python3.6 bazelci.py runner --task=ubuntu1804_config_01 --file_config=.bazelci/presubmit.yml
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Ran in 6m 14s
:ubuntu: Ubuntu 20.04 LTScurl -sS https://raw.githubusercontent.com/bazelbuild/continuous-integration/master/buildkite/bazelci.py?1717074795 -o bazelci.py && python3.8 bazelci.py runner --task=ubuntu1804_config_02 --file_config=.bazelci/presubmit.yml
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Total Job Run Time: 12m 24s