chore: upgrade go version to 1.24.6

[zhiying-lin]

What type of PR is this?

/kind bug

What this PR does / why we need it:

fix CVE-2025-47907

Which issue(s) this PR fixes:

Fixes #328

Requirements:

• run make reviewable for basic local test
• Read and followed fleet-networking's Code of conduct.
• uses conventional commit messages
• includes documentation
• adds unit tests

How has this code been tested

Special notes for your reviewer

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.61%. Comparing base (b6b9d37) to head (01d88e4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #330      +/-   ##
==========================================
+ Coverage   67.55%   67.61%   +0.05%     
==========================================
  Files          34       34              
  Lines        5046     5046              
==========================================
+ Hits         3409     3412       +3     
+ Misses       1449     1446       -3     
  Partials      188      188              

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