Disable one cannot_allocate search

A workaround for ghc#23139, where T18623 was failing consistently with
this output.

gitlab-bot/ghc_perf_import_service/__init__.py

@@ -223,8 +223,9 @@ class GHCPerfWebhookServer(WebhookServer):
         if grep(b'failed due to signal 9 .Killed'):
             joblog('received signal 9')
             failures.append('signal_9')
-        if (grep(b'Cannot allocate memory')
-                or grep(b'osCommitMemory: VirtualAlloc MEM_COMMIT failed')
+        if (    # Disabling this search due to ghc#23139
+                # grep(b'Cannot allocate memory')
+                grep(b'osCommitMemory: VirtualAlloc MEM_COMMIT failed')
                 or grep(b'out of memory allocating \d+ bytes')
                 ):
             joblog('could not allocate memory')