chore(deps): update crazy-max/ghaction-import-gpg action to v6 (#447)

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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` |

---

### 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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are satisfied.

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rebase/retry checkbox.

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---

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.github/workflows/release.yml

@@ -37,7 +37,7 @@ jobs:
 
     - name: Import GPG key
       id: import_gpg
-      uses: crazy-max/ghaction-import-gpg@v5
+      uses: crazy-max/ghaction-import-gpg@v6
       with:
         gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
         passphrase: ${{ secrets.PASSPHRASE }}