fix: bump go version to 1.23.6 for CVE

[Arvindthiru]

What this PR does / why we need it:

Fixing CVEs,

• CVE-2024-45336
• CVE-2024-45341
• CVE-2025-22866

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

[kaito-pr-agent]

Title

fix: bump go version to 1.23.6 for CVE

---

User description

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

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

---

PR Type

bug_fix

---

Description

• Bumps Go version to 1.23.6 across multiple workflows and Dockerfiles for CVE.

• Updates Go version in go.mod to match the new workflow configuration.

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Changes walkthrough 📝

	Relevant files
Bug_fix	3 files unit-integration-tests.yml Update Go version to 1.23.6                                                            member-net-controller-manager.Dockerfile Update Go version to 1.23.6                                                            go.mod Update Go version to 1.23.6                                                            +1/-1
Additional files	9 files build-publish-mcr.yml +1/-1      e2e-tests.yml +1/-1      go.yml +1/-1      publish-image.yml +1/-1      trivy.yml +1/-1      unit-integration-tests.yml +1/-1      hub-net-controller-manager.Dockerfile +1/-1      mcs-controller-manager.Dockerfile +1/-1      member-net-controller-manager.Dockerfile +1/-1

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[kaito-pr-agent]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ No major issues detected

[kaito-pr-agent]

PR Code Suggestions ✨

No code suggestions found for the PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.99%. Comparing base (5c38041) to head (22c80ce).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
- Coverage   80.49%   79.99%   -0.50%     
==========================================
  Files          29       29              
  Lines        4024     4024              
==========================================
- Hits         3239     3219      -20     
- Misses        625      640      +15     
- Partials      160      165       +5     

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[zhiying-lin]

Please update your PR description to include the CVE info