mega-linter: beta instead of v8.7.0 to test GHA step summary support

Author: vogler

.github/workflows/mega-linter.yml

@@ -61,7 +61,7 @@ jobs:
         # You can override MegaLinter flavor used to have faster performances
         # More info at https://megalinter.io/latest/flavors/
         # uses: oxsecurity/megalinter@v8 # default (127 linters)
-        uses: oxsecurity/megalinter/flavors/cupcake@v8.7.0 # most common, was recommended in output (88 linters)
+        uses: oxsecurity/megalinter/flavors/cupcake@beta # most common, was recommended in output (88 linters)
 
         id: ml