chore(deps): update ruby/setup-ruby digest to 9669f3e (#306)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| ruby/setup-ruby | action | digest | `31a7f6d` -> `9669f3e` |

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.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
         run: export DISPLAY=:99.0
 
       - name: Install Ruby
-        uses: ruby/setup-ruby@31a7f6d628878b80bc63375a93ae079ec50a1601
+        uses: ruby/setup-ruby@9669f3ee51dc3f4eda8447ab696b3ab19a90d14b
         with:
           ruby-version: 2.7.3