Update actions/checkout digest to 7dd9e2a (#58)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://togithub.com/actions/checkout) | action | digest | `2541b12` -> `7dd9e2a` |

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### Configuration

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

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

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.github/workflows/maven.yml

@@ -16,7 +16,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # tag=v3
+      - uses: actions/checkout@7dd9e2a3dc350cf687eb1b2a4fadfee8c8e49675 # v3
       - name: Set up JDK 11
         uses: actions/setup-java@d854b6da19cdadd9a010605529e522c2393ebd38 # tag=v3
         with: