chore: bump actions/checkout from 6 to 7 in the ci group (#728)

Bumps the ci group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `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](actions/checkout@v6...v7)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Check formatting
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: install stable toolchain
         uses: dtolnay/rust-toolchain@master
@@ -50,7 +50,7 @@ jobs:
     runs-on: ubuntu-22.04
     needs: find-msrv
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: EmbarkStudios/cargo-deny-action@v2
         with:
           rust-version: ${{ needs.find-msrv.outputs.version }}
@@ -83,7 +83,7 @@ jobs:
             adapters: "-p accesskit_ios"
     name: cargo clippy (${{ matrix.name }})
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: install stable toolchain
         uses: dtolnay/rust-toolchain@stable
@@ -109,7 +109,7 @@ jobs:
     outputs:
       version: ${{ steps.step2.outputs.version }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - id: step2
         run: echo "version=`cat Cargo.toml | sed -n 's/rust-version = "\(.*\)"/\1/p'`" >> "$GITHUB_OUTPUT"
 
@@ -138,7 +138,7 @@ jobs:
             adapters: "-p accesskit_ios"
     name: cargo test (${{ matrix.name }})
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - name: install stable toolchain
         uses: dtolnay/rust-toolchain@master
@@ -158,7 +158,7 @@ jobs:
   check-android-dex:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: actions/setup-java@v5
         with:
           distribution: 'temurin'