Clean cache on upstream update

scripts/upstreamMerge.sh

@@ -34,6 +34,7 @@ fi
 if [ "$updated" == "1" ]; then
     echo "Rebuilding patches without filtering to improve apply ability"
     cd "$basedir"
+    ./gradlew cleanCache || exit 1 # todo: Figure out why this is necessary
     ./gradlew applyPatches -Dpaperweight.debug=true || exit 1
     ./gradlew rebuildPatches || exit 1
 fi