chore(deps): update actions/cache action to v6.1.0 (#1468)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/cache](https://redirect.github.com/actions/cache) | action |
minor | `v6` → `v6.1.0` |

---

### Release Notes

<details>
<summary>actions/cache (actions/cache)</summary>

###
[`v6.1.0`](https://redirect.github.com/actions/cache/releases/tag/v6.1.0)

[Compare
Source](https://redirect.github.com/actions/cache/compare/v6.0.0...v6.1.0)

##### What's Changed

- Bump
[@&#8203;actions/cache](https://redirect.github.com/actions/cache) to
v6.1.0 - handle read-only cache access by
[@&#8203;jasongin](https://redirect.github.com/jasongin) in
[#&#8203;1768](https://redirect.github.com/actions/cache/pull/1768)

**Full Changelog**:
<actions/cache@v6...v6.1.0>

</details>

---

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are satisfied.

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rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
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---

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this box

---

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.github/workflows/checks.yml

@@ -27,7 +27,7 @@ jobs:
         shell: bash
 
       - name: Cache dependencies
-        uses: actions/cache@v6
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: .venv
           key: ${{ runner.os }}-${{ steps.get_python_version.outputs.python_version }}-dependencies-${{ hashFiles('**/pdm.lock') }}
@@ -86,7 +86,7 @@ jobs:
         shell: bash
 
       - name: Cache dependencies
-        uses: actions/cache@v6
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: .venv
           key: ${{ runner.os }}-${{ steps.get_python_version.outputs.python_version }}-min-dependencies-${{ hashFiles('**/pdm.lock') }}
@@ -168,7 +168,7 @@ jobs:
         id: get_python_version
         run: echo "python_version=$(python --version)" >> $GITHUB_OUTPUT
       - name: Cache Generated Client Dependencies
-        uses: actions/cache@v6
+        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: integration-tests/.venv
           key: ${{ runner.os }}-${{ steps.get_python_version.outputs.python_version }}-integration-dependencies-${{ hashFiles('integration-tests/pdm*.lock') }}