Ignore llvm_zlib and llvm_zstd packages in the renovate config.

They are pinned to the version used by the llvm project as per the example here https://github.com/llvm/llvm-project/blob/main/utils/bazel/examples/http_archive/WORKSPACE.

Change-Id: I7163422d2c2e845ad50e96b2a8cf7d960e7b5e26
Test: N/A
Bug: N/A
GitOrigin-RevId: 5d13034e9883d87ecfbc4e1dbe79b9daa629a3e6

renovate.json5

@@ -35,6 +35,13 @@
         ],
         "schedule": ["every month"],
         "groupName": "protobuf"
+      },
+      { // Ignore llvm_zlib and llvm_zstd packages as they are pinned to the version used by the llvm project.
+        "matchPackagePrefixes": [
+          "llvm_zlib",
+          "llvm_zstd",
+        ],
+        "enabled": false
       }
     ]
 }