go: update Go version to 1.25.5 (#9900) (#10053)

[okJiang]

What problem does this PR solve?

Issue Number: Close #10034

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot]

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[okJiang]

/retest

[codecov]

Codecov Report

❌ Patch coverage is 86.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.45%. Comparing base (65e429d) to head (798b87f).

Additional details and impacted files

@@                       Coverage Diff                       @@
##           release-8.5-20260130-v8.5.3   #10197      +/-   ##
===============================================================
- Coverage                        77.59%   77.45%   -0.15%     
===============================================================
  Files                              463      463              
  Lines                            61110    61110              
===============================================================
- Hits                             47419    47331      -88     
- Misses                           10194    10278      +84     
- Partials                          3497     3501       +4     

Flag	Coverage Δ
unittests	77.45% <86.00%> (-0.15%)	⬇️

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