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] <[email protected]>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Build tests
       run: |
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Build tests
       run: docker buildx build . --target test-clang -t spectrum:tests-clang
@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Build tests
       run: docker buildx build . --target test-musl -t spectrum:tests-musl
@@ -43,7 +43,7 @@ jobs:
   macos:
     runs-on: macos-14
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install MacPorts
       run: |
         curl -L -O "https://github.com/macports/macports-base/releases/download/v2.9.0/MacPorts-2.9.0-14-Sonoma.pkg"
@@ -72,7 +72,7 @@ jobs:
   windows:
     runs-on: windows-2022
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install dependencies
       run: |
         curl -L -O https://packages.spectrum.im/deps32.zip
@@ -99,7 +99,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Build from Dockerfile\.trixie
       run: docker build -f Dockerfile\.trixie -t spectrum:trixie \.

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
       contents: read
       packages: write
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Docker meta
       id: docker_meta
       uses: crazy-max/ghaction-docker-meta@v5