Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build-toolchain.yml

@@ -26,7 +26,7 @@ jobs:
     outputs:
       entries: ${{ steps.generate.outputs.entries }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dorny/paths-filter@v3
         id: changes
         with:
@@ -95,7 +95,7 @@ jobs:
             fi
           done
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           path: swiftwasm-build
           submodules: true

.github/workflows/update-snapshot.yml

@@ -6,7 +6,7 @@ jobs:
   update-snapshot:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Configure git user
         run: |
           git config --global user.name "github-actions[bot]"