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
  • Between 12:00 AM and 07:59 AM, only on Tuesday (* 0-7 * * 2)
• 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 90.29%. Comparing base (2fe0a14) to head (2c6274c).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8340      +/-   ##
============================================
- Coverage     90.30%   90.29%   -0.01%     
+ Complexity     7723     7722       -1     
============================================
  Files           850      850              
  Lines         23256    23256              
  Branches       2363     2363              
============================================
- Hits          21002    21000       -2     
- Misses         1528     1529       +1     
- Partials        726      727       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.