[github-actions] Update actions/checkout action to v7

| datasource  | package          | from   | to     |
| ----------- | ---------------- | ------ | ------ |
| github-tags | actions/checkout | v6.0.3 | v7.0.0 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/test.yml

@@ -36,7 +36,7 @@ jobs:
             toxenv: typing
     steps:
       - name: Check out repository
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
         with:
           persist-credentials: false