Pin erlef/setup-beam action to e6d7c94

Author: renovate[bot]

.github/actions/setup/action.yml

@@ -10,7 +10,7 @@ outputs:
 runs:
   using: composite
   steps:
-    - uses: erlef/setup-beam@v1
+    - uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1
       id: setup-beam
       with:
         version-file: .tool-versions