Update https://data.forgejo.org/actions/setup-forgejo action to v3.1.3 (#1515)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [https://data.forgejo.org/actions/setup-forgejo](https://code.forgejo.org/actions/setup-forgejo) | action | patch | `v3.1.2` → `v3.1.3` |

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### Release Notes

<details>
<summary>actions/setup-forgejo (https://data.forgejo.org/actions/setup-forgejo)</summary>

### [`v3.1.3`](https://code.forgejo.org/actions/setup-forgejo/releases/tag/v3.1.3)

[Compare Source](https://code.forgejo.org/actions/setup-forgejo/compare/v3.1.2...v3.1.3)

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- other
  - [PR](https://code.forgejo.org/actions/setup-forgejo/pulls/860): <!--number 860 --><!--line 0 --><!--description VXBkYXRlIGRlcGVuZGVuY3kgZm9yZ2Vqby9ydW5uZXIgdG8gdjEyLjYuMg==-->Update dependency forgejo/runner to v12.6.2<!--description-->

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</details>

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Reviewed-on: https://code.forgejo.org/forgejo/end-to-end/pulls/1515
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.code.forgejo.org>
Co-authored-by: Renovate Bot <bot@kriese.eu>
Co-committed-by: Renovate Bot <bot@kriese.eu>

.forgejo/prepare-end-to-end/action.yml

@@ -15,7 +15,7 @@ runs:
             /usr/local/bin/garage
           key: S3
 
-      - uses: https://data.forgejo.org/actions/setup-forgejo@v3.1.2
+      - uses: https://data.forgejo.org/actions/setup-forgejo@v3.1.3
         with:
           install-only: true
       - run: forgejo-binary.sh ensure_user forgejo