Util: Update git cache path

src/org/moodle/ci/Util.groovy

@@ -49,7 +49,7 @@ def runTask(
                             $class: 'CloneOption',
                             depth: 0,
                             noTags: false,
-                            reference: "${env.HOME}/cache/integration.git",
+                            reference: "${env.HOME}/caches/integration.git",
                             shallow: false
                         ],
                         [