Pin test runner to Ubuntu 18 to un-break CI (GH-24715)

(cherry picked from commit 94894dd45e)

Co-authored-by: Brandt Bucher <brandt@python.org>
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Miss Islington (bot) 2021-03-03 01:56:36 -08:00 committed by GitHub
parent 8b795ab554
commit 024325db58
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@ -121,7 +121,7 @@ jobs:
build_ubuntu:
name: 'Ubuntu'
runs-on: ubuntu-latest
runs-on: ubuntu-18.04
needs: check_source
if: needs.check_source.outputs.run_tests == 'true'
env: