[release-15.0] Bump upgrade test to go1.20.8#13938

frouioui merged 1 commit intovitessio:release-15.0vitessio/vitess:release-15.0from

planetscale:bump-upgrade-test-to-go1.20.8planetscale/vitess:bump-upgrade-test-to-go1.20.8Copy head branch name to clipboard