CompatHelper: bump compat for GPUArrays in [weakdeps] to 12, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the GPUArrays package from 11.5.0 to 11.5.0, 12.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.17%. Comparing base (e951ff2) to head (4cd906f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #343   +/-   ##
=======================================
  Coverage   99.17%   99.17%           
=======================================
  Files          22       22           
  Lines        2304     2304           
=======================================
  Hits         2285     2285           
  Misses         19       19           

☔ View full report in Codecov by Harness.
📢 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.