feat: upgrade to bobcat (#887)

diff --git a/.github/renovate.json b/.github/renovate.json
index 8e4fae4..c9fc620 100644
--- a/.github/renovate.json
+++ b/.github/renovate.json
@@ -21,9 +21,9 @@
       "packageNameTemplate": "https://github.com/openstack/{{{depName}}}",
       "currentValueTemplate": "stable/{{{version}}}",
       "matchStrings": [
-        "ARG PROJECT=(?<depName>.*)",
-        "ARG RELEASE=(?<version>.*)",
-        "ARG REF=(?<currentDigest>.*)"
+        "ARG --global RELEASE=(?<version>.*)",
+        "ARG --global PROJECT=(?<depName>.*)",
+        "ARG --global PROJECT_REF=(?<currentDigest>.*)"
       ]
     },
     {