src: escape Windows environment variables in task runner

[aduh95]

No description provided.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/75781/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/75783/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.32%. Comparing base (404b0cf) to head (9e7a313).
⚠️ Report is 24 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #65217   +/-   ##
=======================================
  Coverage   90.32%   90.32%           
=======================================
  Files         760      760           
  Lines      248525   248553   +28     
  Branches    46894    46911   +17     
=======================================
+ Hits       224488   224516   +28     
+ Misses      15469    15466    -3     
- Partials     8568     8571    +3     

Files with missing lines	Coverage Δ
src/node_task_runner.cc	89.32% <ø> (ø)

... and 56 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/75786/