chore: Update frontend tests to use latest ubuntu environment

[fsbraun]

Description

Related resources

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Checklist

• I have opened this pull request against master
• I have added or modified the tests when changing logic
• I have followed the conventional commits guidelines to add meaningful information into the changelog
• I have read the contribution guidelines and I have joined #workgroup-pr-review on
  Slack to find a “pr review buddy” who is going to review my pull request.

Summary by Sourcery

CI:

• Update frontend CI workflow to use ubuntu-latest for the gulp job

[sourcery-ai]

Reviewer's Guide

The PR updates the GitHub Actions frontend workflow to use the latest Ubuntu environment (ubuntu-latest) instead of a fixed ubuntu-20.04 runner.

File-Level Changes

Change	Details	Files
CI workflow environment version bump	Replaced runs-on value “ubuntu-20.04” with “ubuntu-latest”	.github/workflows/frontend.yml

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[sourcery-ai]

Hey @fsbraun - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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