Bump actions/checkout from 5 to 6 (#125)

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -27,7 +27,7 @@ jobs:
     steps:
       ############ Setup ############
       - name: Repo checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: Install C++ dependencies
@@ -190,7 +190,7 @@ jobs:
       checks: write
     steps:
       - name: Repo checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: Rust toolchain
@@ -277,7 +277,7 @@ jobs:
       matrix:
         rust-version: ["msrv", "stable"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install toml-cli using cargo
         uses: baptiste0928/cargo-install@v3
         with:

.github/workflows/security_scan.yaml

@@ -19,7 +19,7 @@ jobs:
     steps:
       ############ Setup ############
       - name: Repo checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: Rust toolchain