Remove renovate from release/v1.33.x branch (#12275)

Author: laurit

.github/renovate.json5

@@ -4,7 +4,6 @@
     "config:base"
   ],
   "ignorePaths": ["instrumentation/**"],
-  "baseBranches": ["main", "release/v1.33.x"],
   // needed in order to get patch-only updates in package rules below
   // unfortunately you can't combine updateTypes and separateMinorPatch in the same package rule
   // so we have to apply it globally here, see