Fix CS7035 warning in dependabot jobs

[martincostello]

Fix CS7035 warnings from $GITHUB_RUN_NUMBER not being set when dependabot jobs run.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.15%. Comparing base (a83d82c) to head (fd50ba6).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2849   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files         309      309           
  Lines        7127     7127           
  Branches     1005     1005           
=======================================
  Hits         6853     6853           
  Misses        221      221           
  Partials       53       53           

Flag	Coverage Δ
linux	96.15% <ø> (ø)
macos	96.15% <ø> (ø)
windows	96.14% <ø> (ø)

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[Copilot]

Pull request overview

This PR addresses CS7035 warnings that occur during dependabot jobs when the GITHUB_RUN_NUMBER environment variable is not set. The fix wraps the variable reference with MSBuild's ValueOrDefault function to provide a fallback value of '0'.

• Wraps GITHUB_RUN_NUMBER with ValueOrDefault('$(GITHUB_RUN_NUMBER)', '0') in the FileVersion property to prevent build warnings when the environment variable is not available

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