Update contributors/devel/sig-testing/flaky-tests.md

Co-authored-by: Tim Bannister <[email protected]>

Author: aojea

contributors/devel/sig-testing/flaky-tests.md

@@ -13,6 +13,7 @@ path.
 The project has a "zero-flake" policy. Test jobs must not automatically retry on test failures.
 This was announced and implemented in effect from 2019:
 [No more ginkgo.flakeAttempts=2 for e2e tests as of 2019-12-13](https://groups.google.com/g/kubernetes-dev/c/NNmEGUsJObg/m/dmI2mVc_AAAJ)
+(and then confirmed as policy in 2023).
 
 For more information about deflaking Kubernetes tests, you can watch:
 - @liggitt's [presentation from Kubernetes SIG Testing - 2020-08-25](https://www.youtube.com/watch?v=Ewp8LNY_qTg).