fix tag for base test job

Author: Jonathan Shook

.github/workflows/unit-tests.yaml

@@ -132,7 +132,7 @@ jobs:
         uses: actions/upload-artifact@v4
         if: always() # ensures upload happens even if tests fail
         with:
-          name: surefire-results--${{ matrix.isa }}-${{ matrix.jdk }}
+          name: surefire-results--${{ matrix.os }}-${{ matrix.jdk }}
           path: "**/target/surefire-reports/**"