Update dependency ubuntu to v26

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ubuntu	github-runner	major	24.04 → 26.04

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[Copilot]

Copilot review overview

🟢 Approval recommended

The change is a straightforward runner image bump in a single workflow file with no additional logic changes.

Review effort: Lite
Findings: None

What changed in this PR

Updates the GitHub Actions runner image used by the documentation validation workflow to the newer Ubuntu 26.04 runner, aligning CI execution with the latest supported runner environment.

Changes:

• Bump runs-on in docs_validate.yml from ubuntu-24.04 to ubuntu-26.04.

File	Description
.github/​workflows/​docs_validate.yml	Updates the workflow runner image to Ubuntu 26.04 for doc validation jobs.

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[Andrew Arnott (AArnott)]

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[Codecov Comments Bot (codecov-commenter)]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.88%. Comparing base (085a730) to head (e0affae).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #408   +/-   ##
=======================================
  Coverage   77.88%   77.88%           
=======================================
  Files          14       14           
  Lines         859      859           
  Branches      224      224           
=======================================
  Hits          669      669           
  Misses        126      126           
  Partials       64       64           

Flag	Coverage Δ
Linux	79.18% <ø> (ø)
Windows	77.88% <ø> (ø)

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