Bump actions/checkout from 5 to 6 (#543)

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

Author: dependabot[bot]

.github/workflows/autobahn.yml

@@ -42,7 +42,7 @@ jobs:
       AUTOBAHN_CASES: ${{ matrix.case }}
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Setup Elixir
       uses: erlef/setup-beam@v1
       with:

.github/workflows/benchmark.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Install nghttp2
       run: sudo apt-get install nghttp2
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: mtrudel/benchmark
     - name: Setup Elixir

.github/workflows/h2spec.yml

@@ -23,7 +23,7 @@ jobs:
         otp: ${{ fromJSON(inputs.erlangs) }}
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Setup Elixir
       uses: erlef/setup-beam@v1
       with:

.github/workflows/hex_publish.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Setup Elixir
       uses: erlef/setup-beam@v1
       with:

.github/workflows/manual_benchmark.yml

@@ -59,7 +59,7 @@ jobs:
     - name: Install nghttp2
       run: sudo apt-get install nghttp2
     - name: Checkout code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with: 
         repository: mtrudel/benchmark
     - name: Setup Elixir