chore(deps): Pin dependencies (#94)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://redirect.github.com/actions/checkout) | action | pinDigest |  → `de0fac2` |
| [actions/setup-python](https://redirect.github.com/actions/setup-python) | action | pinDigest |  → `a309ff8` |

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> Some dependencies could not be looked up. Check the [Dependency Dashboard](../issues/1) for more information.

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Author: cq-bot

.github/workflows/ci.yml

@@ -14,10 +14,10 @@ jobs:
         python-version: ["3.11"]
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
         with:
           python-version: ${{ matrix.python-version }}
           cache: "pip"