chore(deps): update actions/checkout action to v5

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [Flask](https://github.com/pallets/flask) ([changelog](https://flask.palletsprojects.com/page/changes/)) | `==3.1.1` -> `==3.1.2` | [![age](https://developer.mend.io/api/mc/badges/age/pypi/flask/3.1.2?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/flask/3.1.1/3.1.2?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>pallets/flask (Flask)</summary>

### [`v3.1.2`](https://github.com/pallets/flask/blob/HEAD/CHANGES.rst#Version-312)

[Compare Source](https://github.com/pallets/flask/compare/3.1.1...3.1.2)

Released 2025-08-19

- `stream_with_context` does not fail inside async views. :issue:`5774`
- When using `follow_redirects` in the test client, the final state
  of `session` is correct. :issue:`5786`
- Relax type hint for passing bytes IO to `send_file`. :issue:`5776`

</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: #150
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Co-committed-by: Renovate [BOT] <renovate-bot@git.tainton.uk>

.ARCHIVE/requirements.txt

@@ -1,7 +1,7 @@
 certifi==2025.8.3
 charset-normalizer==3.4.3
 click==8.2.2
-Flask==3.1.1
+Flask==3.1.2
 Flask-WTF==1.2.2
 idna==3.10
 itsdangerous==2.2.0

.gitea/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository code
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.0
         with:
           fetch-depth: 0
 

.gitea/workflows/release.yml

@@ -45,7 +45,7 @@ jobs:
           REPO: ${{ gitea.repository }}
 
       - name: Check out repository
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.0
         with:
           fetch-depth: 0
           ref: ${{ needs.tag.outputs.tag_name }}

.gitea/workflows/snyk.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v5.0.0
 
       - name: Snyk
         uses: snyk/actions/python@master