chore(deps): bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/upload-docs.yml

@@ -15,7 +15,7 @@ jobs:
       url: https://rs.delta.chat/
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           show-progress: false
           persist-credentials: false
@@ -36,7 +36,7 @@ jobs:
       url: https://py.delta.chat/
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           show-progress: false
           persist-credentials: false
@@ -58,7 +58,7 @@ jobs:
       url: https://c.delta.chat/
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           show-progress: false
           persist-credentials: false
@@ -84,7 +84,7 @@ jobs:
         working-directory: ./deltachat-jsonrpc/typescript
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           show-progress: false
           persist-credentials: false
@@ -113,7 +113,7 @@ jobs:
       url: https://cffi.delta.chat/
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           show-progress: false
           persist-credentials: false