test: disable cron job running anchore

I don't need it running on a schedule. Unlike the ci workflow which
has more moving/changing parts, anchore test results are pretty stable
unless there is a change to the docker config.

Author: rouilj

.github/workflows/anchore.yml

@@ -17,8 +17,8 @@ on:
   pull_request:
     # The branches below must be a subset of the branches above
     branches: [ "master" ]
-  schedule:
-    - cron: '38 21 * * 6'
+  #schedule:
+    #- cron: '38 21 * * 6'
 
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   contents: read