Fix MegaLinter workflow location

Sold to "Ox Security", so repo ownership has changed.

Author: TimoWilken

.github/workflows/mega-linter.yml

@@ -33,7 +33,7 @@ jobs:
         id: ml
         # You can override MegaLinter flavor used to have faster performances
         # More info at https://megalinter.github.io/flavors/
-        uses: megalinter/megalinter@v5
+        uses: oxsecurity/megalinter@v5
         env:
           # All available variables are described in documentation
           # https://megalinter.github.io/configuration/