Use old Gradle property

Author: marcphilipp

.github/workflows/cross-version.yml

@@ -59,6 +59,6 @@ jobs:
         uses: ./.github/actions/run-gradle
         with:
           arguments: |
-            -PjavaToolchain.version=${{ matrix.jdk.version }} \
+            -PjavaToolchainVersion=${{ matrix.jdk.version }} \
             -Dscan.tag.JDK_${{ matrix.jdk.version }} \
             build