Build/Test Tools: Use newer runner images for MacOS & Windows.

GitHub is in the process of deploying an update to their MacOS and Windows GitHub Actions runners that changes the `-latest` tag to point to `macos-15` and `windows-2025`. Once this completes, the number of available runners for the previous version will decline and could result in longer queues.

This updates the build process testing workflow to test against these new versions.

Prop johnbillion. 
See #63170.

git-svn-id: https://develop.svn.wordpress.org/trunk@60626 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

.github/workflows/test-build-processes.yml

@@ -90,7 +90,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ 'macos-14', 'windows-2022' ]
+        os: [ 'macos-15', 'windows-2025' ]
         directory: [ 'src', 'build' ]
     with:
       os: ${{ matrix.os }}
@@ -131,7 +131,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ 'macos-14', 'windows-2022' ]
+        os: [ 'macos-15', 'windows-2025' ]
         directory: [ 'src', 'build' ]
     with:
       os: ${{ matrix.os }}