ci: enable cache by default (#35121)

* enable cache for Mac brew and scons

* bump

* save cache by default, explicitly opt-out

* Delete bump-ci

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Co-authored-by: Maxime Desroches <desroches.maxime@gmail.com>

.github/workflows/auto-cache/action.yaml

@@ -12,7 +12,7 @@ inputs:
     required: true
   save:
     description: 'whether to save the cache'
-    default: 'false'
+    default: 'true'
     required: false
 outputs:
   cache-hit: