[skip ci] Renovate json fix (#1696)

* Regex fix backslashes

* Add required `depNameTemplate`

It's not used, but renovate requires it

renovate.json

@@ -13,8 +13,9 @@
       "matchStrings": [
         "JRE_RELEASE=[\"'](?<currentValue>.+?)[\"']\\s+"
       ],
+      "depNameTemplate": "zulu",
       "datasourceTemplate": "custom.zulu",
-      "versioningTemplate": "regex:^(?<major>\\d+)\.(?<minor>\\d+)\.(?<patch>\\d+).*$"
+      "versioningTemplate": "regex:^(?<major>\\d+)\\.(?<minor>\\d+)\\.(?<patch>\\d+).*$"
     }
   ],
   "customDatasources": {