bump K8s to v1.26.12

[csuzhangxc]

What problem does this PR solve?

Bump the K8s deps to v1.26.12.

Some APIs are deprecated (ref https://kubernetes.io/docs/reference/using-api/deprecation-guide/#v1-26), but they don't affect TiDB Operator.

Some other changes:

• Introduce APIs to support CrossNamespaceVolumeDataSource kubernetes/kubernetes#113186
• dynamic resource allocation kubernetes/kubernetes#111023

also ref pingcap/advanced-statefulset#111

What is changed and how does it work?

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (aa561f6) 61.38% compared to head (baf8b30) 67.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5494      +/-   ##
==========================================
+ Coverage   61.38%   67.18%   +5.79%     
==========================================
  Files         234      245      +11     
  Lines       29930    33778    +3848     
==========================================
+ Hits        18374    22694    +4320     
+ Misses       9717     9210     -507     
- Partials     1839     1874      +35     

Flag	Coverage Δ
e2e	46.41% <ø> (?)
unittest	61.38% <ø> (ø)

[csuzhangxc]

/run-all-tests

[csuzhangxc]

/run-pull-e2e-kind-across-kubernetes

[csuzhangxc]

/run-pull-e2e-kind-basic