Bump Go to v1.20.8

[twz123]

Description

Fixes CVE-2023-39318, CVE-2023-39319, CVE-2023-39320, CVE-2023-39321 and CVE-2023-39322.

https://groups.google.com/g/golang-announce/c/Fm51GRLNRvM/m/F5bwBlXMAQAJ

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

• Manual test
• Auto test added

Checklist:

• My code follows the style guidelines of this project
• My commit messages are signed-off
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[k0s-bot]

Backport failed for release-1.27, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally.

git fetch origin release-1.27
git worktree add -d .worktree/backport-3459-to-release-1.27 origin/release-1.27
cd .worktree/backport-3459-to-release-1.27
git checkout -b backport-3459-to-release-1.27
ancref=$(git merge-base 6e4a6b8ca9f30cb85c8792dcbbc6030f23c74023 04da6de2ee168d6ab4513474488e24bd1c9abfac)
git cherry-pick -x $ancref..04da6de2ee168d6ab4513474488e24bd1c9abfac