Upgrade Go to 1.26

[jihuayu]

Upgrade Go to 1.26

Update CI to make sure it pass.

PS: Go’s newer vet rules treat using a variable as a printf format string as risky. The minimal fix is to explicitly use "%s" at the output site.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.31%. Comparing base (6c56470) to head (3f6293f).
⚠️ Report is 106 commits behind head on unstable.

Files with missing lines	Patch %	Lines
cmd/client/command/list.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable     #394      +/-   ##
============================================
+ Coverage     43.38%   47.31%   +3.92%     
============================================
  Files            37       45       +8     
  Lines          2971     3906     +935     
============================================
+ Hits           1289     1848     +559     
- Misses         1544     1847     +303     
- Partials        138      211      +73     

Flag	Coverage Δ
unittests	47.31% <0.00%> (+3.92%)	⬆️

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