deps,version: bump client-go for nextgen 202603

[wfxr]

What problem does this PR solve?

Issue Number: ref #5206

This is a release-nextgen-202603 follow-up to #5205.

The release-nextgen-202603 branch needs to consume the latest TiCDC-specific github.com/tikv/client-go/v2 branch revision for nextgen shared-lock related fixes: tikv/client-go#2000

The branch also needs the TiKV compatibility upper bound aligned with the nextgen release version range.

What is changed and how it works?

• Bump github.com/tikv/client-go/v2 from v2.0.8-0.20260609065146-a68b42e6aab4 to v2.0.8-0.20260610130222-a41cab3aaf31.
• Update go.sum with the new client-go checksum.
• Raise maxTiKVVersion from 15.0.0 to 26.4.0.

Check List

Tests

• Unit test
• Manual test

Local checks run:

• go mod tidy
• git diff --check upstream/release-nextgen-202603..HEAD
• GOCACHE=/tmp/ticdc-go-cache go test ./pkg/version
• GOCACHE=/tmp/ticdc-go-cache make cdc

Questions

Will it cause performance regression or break compatibility?

No expected performance regression. The dependency bump is limited to the TiCDC-specific client-go branch for nextgen shared-lock fixes, and the version compatibility bound is adjusted for the nextgen release range.

Do you need to update user documentation, design documentation or monitoring documentation?

No.

Release note

None.

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All committers have signed the CLA.

[gemini-code-assist]

Code Review

This pull request updates the github.com/tikv/client-go/v2 dependency in go.mod and go.sum. Additionally, it increases the maximum compatible TiKV version (maxTiKVVersion) from 15.0.0 to 26.4.0 in pkg/version/check.go. There are no review comments to address, and I have no additional feedback to provide.

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[wfxr]

/test next-gen