chore(deps): update actions/checkout action to v6 (#26)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://github.com/actions/checkout) | action | major | `v4` -> `v6` |

---

### Release Notes

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

### [`v6`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v602)

[Compare Source](https://github.com/actions/checkout/compare/v5...v6)

- Fix tag handling: preserve annotations and explicit fetch-tags by [@&#8203;ericsciple](https://github.com/ericsciple) in https://github.com/actions/checkout/pull/2356

### [`v5`](https://github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v501)

[Compare Source](https://github.com/actions/checkout/compare/v4...v5)

- Port v6 cleanup to v5 by [@&#8203;ericsciple](https://github.com/ericsciple) in https://github.com/actions/checkout/pull/2301

</details>

---

### Configuration

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

---

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---

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Reviewed-on: #26
Co-authored-by: APF Portal Bot <jgautier.webdev+apf-portal-bot@gmail.com>
Co-committed-by: APF Portal Bot <jgautier.webdev+apf-portal-bot@gmail.com>

.gitea/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
   check:
     runs-on: [self-hosted, on-prem]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       # Derive NX_BASE / NX_HEAD for `nx affected`. Replaces
@@ -56,7 +56,7 @@ jobs:
   scan:
     runs-on: [self-hosted, on-prem]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v3
       - uses: actions/setup-node@v4
         with:
@@ -85,7 +85,7 @@ jobs:
     if: github.event_name == 'pull_request' && github.event.pull_request.user.login != 'apf-portal-bot'
     runs-on: [self-hosted, on-prem]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: pnpm/action-setup@v3
@@ -111,7 +111,7 @@ jobs:
     container:
       image: catthehacker/ubuntu:full-22.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v3
       - uses: actions/setup-node@v4
         with:
@@ -128,7 +128,7 @@ jobs:
   a11y:
     runs-on: [self-hosted, on-prem]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v3
       - uses: actions/setup-node@v4
         with: