Remove obsolete integration test go.mod reference

Author: thardeck

.github/renovate.json

@@ -14,20 +14,6 @@
     "**/assets/**"
   ],
   "packageRules": [
-    {
-      "description": "Update indirect dependencies in integrationtests/go.mod only when the same dependency is updated elsewhere in the workspace",
-      "matchManagers": [
-        "gomod"
-      ],
-      "matchDepTypes": [
-        "indirect"
-      ],
-      "matchFileNames": [
-        "integrationtests/go.mod"
-      ],
-      "enabled": true,
-      "minimumGroupSize": 2
-    },
     {
       "matchBaseBranches": [
         "release/v0.15"