mlh: update Jenkins jobs following 1.23 support

[nbusseneau]

Following merge of #18008, we now support K8s 1.22 and have rotated the Jenkins test jobs as follow:

• Changed: Kernel 4.9 testing on K8s 1.23 (instead of 1.22)
• Changed: Kernel 4.19 testing on K8s 1.22 (instead of 1.21)
• Changed: Kernel 5.4 testing on K8s 1.21 (instead of 1.20)
• Added: Kernel 4.9 testing on K8s 1.21

See the Table of Truth:tm: for up to date status on all trigger phrases: https://docs.google.com/spreadsheets/d/1TThkqvVZxaqLR-Ela4ZrcJ0lrTJByCqrbdCjnI32_X0/edit#gid=0

[nbusseneau]

/test

Job 'Cilium-PR-K8s-1.22-kernel-4.19' has 1 failure but they might be new flake since it also hit 1 known flake: #17881 (97.29)

Job 'Cilium-PR-K8s-GKE' failed and has not been observed before, so may be related to your PR:

Click to show.

Test Name

K8sDatapathConfig Host firewall Check connectivity with IPv6 disabled

Failure Output

FAIL: Pods are not ready in time: timed out waiting for pods with filter  to be ready: 4m0s timeout expired

If it is a flake, comment /mlh new-flake Cilium-PR-K8s-GKE so I can create a new GitHub issue to track it.

[aanm]

This will be backported to 1.11 as is, right?

[nbusseneau]

Not as-is, but needs manual backporting of similar changes (after we merge #18027). Re-adding label :)

Note to Top Hat: we added the backport label to not forget about it, but the changes from this PR will not apply cleanly on 1.11. First, we need #18027 merged (to pick up changes from #18008 on 1.11), then we need manual actions on Jenkins (that's on me) and then we need similar changes made on 1.11 MLH config (I can do it right after Jenkins, that'll be easier). Just a heads up that you don't need to backport it.