ci: re-trigger to clear flaky FlinkRequiresStableInputTest

The PreCommit Java failure on the previous run was a single timeout in
FlinkRequiresStableInputTest.testParDoRequiresStableInputPortable
(:runners:flink:1.17:test) — known flake tracked in #21333. This PR
does not touch any Flink code. Squash or drop on rebase before merge.

Author: tkaymak