chore: update Go version to 1.26.2

[cuixq]

This PR updates the project's Go version from 1.26.1 to 1.26.2. This includes updating the go.mod file, internal scripts, documentation, and all associated Docker images.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.63%. Comparing base (369c48e) to head (d770a5e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2706      +/-   ##
==========================================
+ Coverage   71.60%   71.63%   +0.03%     
==========================================
  Files         164      164              
  Lines       12090    12090              
==========================================
+ Hits         8657     8661       +4     
+ Misses       2805     2803       -2     
+ Partials      628      626       -2     

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