chore(deps): update ubuntu docker tag to v26

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ubuntu	container	major	24.04 → 26.04

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • "before 3am on Monday"
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.86%. Comparing base (edbe669) to head (c8a3d3e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6635      +/-   ##
==========================================
- Coverage   94.87%   94.86%   -0.01%     
==========================================
  Files         376      376              
  Lines       12699    12699              
  Branches     2882     2882              
==========================================
- Hits        12048    12047       -1     
- Misses        651      652       +1     

see 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[trentm]

This feels premature right now. 26.04 isn't even listed at https://documentation.ubuntu.com/project/release-team/list-of-releases/ yet. Also 24.04 is supported until April 2039. ;)

That said, for the benchmarks run /shrug.