chore(jenkins): update base directory for MatrixCheckout cleanup script

Author: lprimak

.jenkins.groovy

@@ -205,9 +205,9 @@ Check console output at "<a href="${env.BUILD_URL}">${env.JOB_NAME} [${env.BRANC
                             if (MATRIX_JDK == latestSupportedJDK) {
                                 sh '''
                                     set -eu
-                                    base_dir="workspace/${JOB_NAME}/.."
+                                    base_dir="workspace"
                                     if [ -d "$base_dir" ]; then
-                                        find "$base_dir" -name MatrixCheckout -mindepth 2 -maxdepth 2 -type d -mtime +30 -print # -exec rm -rf {} +
+                                        find "$base_dir" -name MatrixCheckout -mindepth 4 -maxdepth 4 -type d -mtime +30 -print # -exec rm -rf {} +
                                     fi
                                 '''
                             }