chore: update actions/checkout and actions/github-script

[Bashamega]

What Changed

I have upgraded the @actions/checkout to v6

Why

Because the project currently uses v4, which uses node v20, which is deprecated.

UI Changes

NONE

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes
  closes bump actions #920

Note

Update actions/checkout to v6 and actions/github-script to v8 in CI and release workflows

Updates GitHub Actions versions across CI and release workflows: actions/checkout bumps from v4 to v6 in ci.yml and release.yml, and actions/github-script bumps from v7 to v8 in pr-vouch.yml.

^{Macroscope summarized d17be06.}

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