build(deps): bump actions/checkout in the all-dependencies-actions group

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


Updates `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
  dependency-group: all-dependencies-actions
...

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

Author: dependabot[bot]

.github/workflows/dependabot-validate.yml

@@ -9,6 +9,6 @@ jobs:
   validate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: marocchino/validate-dependabot@v3
         id: validate

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
       BINARY_NAME: fblog
       CARGO_TERM_COLOR: always
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: docker://messense/rust-musl-cross:x86_64-musl
         with:
           args: cargo build --release

.github/workflows/rust.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Cache folders
         uses: actions/cache@v4