build(deps): bump actions/checkout from 4.1.1 to 4.1.6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.1 to 4.1.6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.1.1...v4.1.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/book.yml

@@ -12,7 +12,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout
-        uses: actions/[email protected].1
+        uses: actions/[email protected].6
 
       - name: Setup mdBook
         uses: peaceiris/[email protected]

.github/workflows/main.yml

@@ -25,7 +25,7 @@ jobs:
         override: true
         components: rustfmt, clippy
 
-    - uses: actions/[email protected].1
+    - uses: actions/[email protected].6
 
     - name: Override bin
       working-directory: bin
@@ -81,7 +81,7 @@ jobs:
         launchctl unload -w ${SL}/LaunchAgents/${PL}.plist
         sudo launchctl unload -w ${SL}/LaunchDaemons/${PL}.Root.plist
 
-    - uses: actions/[email protected].1
+    - uses: actions/[email protected].6
 
     # install stable for kani, cargo-bolero and test runner
     - uses: actions-rs/[email protected]
@@ -113,7 +113,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/[email protected].1
+    - uses: actions/[email protected].6
 
     - uses: actions-rs/[email protected]
       id: toolchain
@@ -136,9 +136,9 @@ jobs:
         repo: ["aws/s2n-quic"]
 
     steps:
-    - uses: actions/[email protected].1
+    - uses: actions/[email protected].6
 
-    - uses: actions/[email protected].1
+    - uses: actions/[email protected].6
       with:
         repository: ${{ matrix.repo }}
         path: "target/integration/${{ matrix.repo }}"