ci: quote Maven selector on Windows

Author: krotname

.github/workflows/maven.yml

@@ -25,7 +25,7 @@ jobs:
           java-version: 21
           cache: maven
       - name: Prime the exact Maven test runtime
-        run: mvn -B -ntp -Dtest=quality.SmokeMethodTestHarnessTest test --file pom.xml
+        run: mvn -B -ntp "-Dtest=quality.SmokeMethodTestHarnessTest" test --file pom.xml
       - name: Run the strict offline test gate
         shell: pwsh
         run: .\scripts\run-offline-gate.ps1 -Goal test -StrictDependencies