chore(deps): update crazy-max/ghaction-import-gpg action to v6 (#170)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [crazy-max/ghaction-import-gpg](https://togithub.com/crazy-max/ghaction-import-gpg) | action | major | `v5` -> `v6` |

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### Release Notes

<details>
<summary>crazy-max/ghaction-import-gpg (crazy-max/ghaction-import-gpg)</summary>

### [`v6`](https://togithub.com/crazy-max/ghaction-import-gpg/compare/v5...v6)

[Compare Source](https://togithub.com/crazy-max/ghaction-import-gpg/compare/v5...v6)

</details>

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### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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

---

 - [ ] If you want to rebase/retry this PR, check this box

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PR-URL: #170
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/lint.yml

@@ -20,7 +20,7 @@ jobs:
 
       - name: Import GPG key
         id: import_gpg
-        uses: crazy-max/ghaction-import-gpg@d6f3f49f3345e29369fe57596a3ca8f94c4d2ca7 # v5
+        uses: crazy-max/ghaction-import-gpg@82a020f1f7f605c65dd2449b392a52c3fcfef7ef # v6
         with:
           gpg_private_key: ${{ secrets.BOT_GPG_KEY }}
           git_user_signingkey: true