Update reviewdog/action-markdownlint action to v0.7 (#383)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [reviewdog/action-markdownlint](https://togithub.com/reviewdog/action-markdownlint) | action | minor | `v0.5` -> `v0.7` |

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### Release Notes

<details>
<summary>reviewdog/action-markdownlint</summary>

### [`v0.7`](https://togithub.com/reviewdog/action-markdownlint/compare/v0.6...v0.7)

[Compare Source](https://togithub.com/reviewdog/action-markdownlint/compare/v0.6...v0.7)

### [`v0.6`](https://togithub.com/reviewdog/action-markdownlint/compare/v0.5...v0.6)

[Compare Source](https://togithub.com/reviewdog/action-markdownlint/compare/v0.5...v0.6)

</details>

---

### Configuration

📅 **Schedule**: "after 5:00 and before 6:00 every weekday" in timezone Europe/Berlin.

🚦 **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, click this checkbox.

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Author: renovate-bot

.github/workflows/reviewdog.yaml

@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # tag=v3.0.2
-      - uses: reviewdog/action-markdownlint@80ee585e1abc8c910891110289a9abbb52bd35df # tag=v0.5
+      - uses: reviewdog/action-markdownlint@e44edac0f8da27da4ae220cb3d5077bd3b6e79c9 # tag=v0.7
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}