chore(renovate): don't create bump PRs for Python

We're not really controlling the version of Python we're using
separately since we use the OS containers for OpenStack so don't bother
creating PRs to bump the version of Python since we'll want to stick
with what we have.

Author: cardoe

.github/renovate.json

@@ -29,6 +29,11 @@
       "matchDatasources": ["golang-version"],
       "groupName": "Go",
       "commitMessageTopic": "Go"
+    },
+    {
+      "enabled": false,
+      "matchPackageNames": ["python"],
+      "matchUpdateTypes": ["major", "minor"]
     }
   ],
   "customManagers": [

.github/renovate/default.json

@@ -9,7 +9,6 @@
     ":approveMajorUpdates",
     "github>rackerlabs/understack//.github/renovate/automergeGitHubActions",
     "github>rackerlabs/understack//.github/renovate/precommit",
-    "github>rackerlabs/understack//.github/renovate/pythonMinorApprove",
     ":maintainLockFilesMonthly",
     ":automergeDigest"
   ]