CI:Cygwin:CMake: Fix upload path for test logs.

Author: DWesl

.github/workflows/run_tests_win_cygwin.yml

@@ -152,4 +152,4 @@ jobs:
         with:
           name: cygwin-cmake-test-logs
           path: |
-            build/Testing/
+            ${{ matrix.build_dir }}/Testing/