tiflash-proxy-next-gen: bump for CMEK encrypted data (#10646)

[ti-chi-bot]

This is an automated cherry-pick of #10646

What problem does this PR solve?

Issue Number: ref #10222

Problem Summary:
When next-gen CMEK is enabled, raft logs and SST files can be encrypted by TiFlash proxy; the currently pinned tiflash-proxy-next-gen version can't recognize/read the encrypted data formats.

What is changed and how it works?

Bump submodule contrib/tiflash-proxy-next-gen to c013b172a259ccf11f23303097cd2b940f13e192 to pick up next-gen CMEK compatibility changes.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  • Verified that when CMEK is enabled and TiFlash is enabled, TiFlash proxy would crash due to InvalidChecksum or encryption_key is not found without this commit.
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

Summary by CodeRabbit

• Chores
  • Updated internal submodule reference to maintain compatibility.

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-01-22 09:08:54.857625164 +0000 UTC m=+657762.471582020: ☑️ agreed by JaySon-Huang.
• 2026-01-22 09:10:47.788524404 +0000 UTC m=+657875.402481250: ☑️ agreed by CalvinNeo.

[ti-chi-bot]

@kolafish: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CalvinNeo, JaySon-Huang, kolafish

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Needs approval from an approver in each of these files:

• OWNERS [CalvinNeo,JaySon-Huang]

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