chore(deps): update namespacelabs/nscloud-checkout-action action to v7 (#137)

This PR contains the following updates:

| Package | Type | Update | Change | OpenSSF |
|---|---|---|---|---|
|
[namespacelabs/nscloud-checkout-action](https://redirect.github.com/namespacelabs/nscloud-checkout-action)
| action | major | `v6` -> `v7` | [![OpenSSF
Scorecard](https://api.securityscorecards.dev/projects/github.com/namespacelabs/nscloud-checkout-action/badge)](https://securityscorecards.dev/viewer/?uri=github.com/namespacelabs/nscloud-checkout-action)
|

---

### Release Notes

<details>
<summary>namespacelabs/nscloud-checkout-action
(namespacelabs/nscloud-checkout-action)</summary>

###
[`v7`](https://redirect.github.com/namespacelabs/nscloud-checkout-action/releases/tag/v7)

[Compare
Source](https://redirect.github.com/namespacelabs/nscloud-checkout-action/compare/v6...v7)

Release candidate for major release v7 with support for unqualified
references.

</details>

---

### 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 becomes conflicted, or you tick the
rebase/retry checkbox.

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

---

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

---

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.github/workflows/solidity.yml

@@ -82,7 +82,7 @@ jobs:
           PAT_TOKEN: op://platform/github-commit-pat/credential
 
       - name: Checkout
-        uses: namespacelabs/nscloud-checkout-action@v6
+        uses: namespacelabs/nscloud-checkout-action@v7
         with:
           token: ${{ env.PAT_TOKEN }}