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/autofix.yml

@@ -5,7 +5,7 @@ jobs:
   autofix:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: sbt/setup-sbt@v1
 

.github/workflows/dependency-graph.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/pre-build.yml

@@ -26,7 +26,7 @@ jobs:
     timeout-minutes: ${{ inputs.timeout-minutes }}
     steps:
       # For normal PR jobs, just checkout the base_ref the PR is against
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with: { fetch-depth: 1 }
 
       - uses: ./.github/actions/pre-build-setup

.github/workflows/publish-artifacts.yml

@@ -64,7 +64,7 @@ jobs:
           distribution: 'temurin'
           java-version: '11'
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with: { fetch-depth: 0 }
 
       - run: "echo temurin:11 > .mill-jvm-version"

.github/workflows/publish-bridges.yaml

@@ -34,7 +34,7 @@ jobs:
           distribution: 'temurin'
           java-version: '11'
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with: { fetch-depth: 0 }
 
       - run: "echo temurin:11 > .mill-jvm-version"

.github/workflows/publish-docs.yml

@@ -25,7 +25,7 @@ jobs:
       MILL_DISABLE_SCALADOC_ANNOTATION: 1
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with: {fetch-depth: 0}
 
       - uses: coursier/cache-action@v7

.github/workflows/run-tests.yml

@@ -13,7 +13,7 @@
 #    runs-on: ubuntu-latest
 ##    runs-on: windows-latest
 #    steps:
-#      - uses: actions/checkout@v5
+#      - uses: actions/checkout@v6
 #        with: { fetch-depth: 1 }
 #
 #      - run: "echo temurin:11 > .mill-jvm-version"
@@ -76,7 +76,7 @@ jobs:
     if: (github.event.action == 'ready_for_review') || (github.event.pull_request.draft == false)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with: { fetch-depth: 1 }
 
       - run: ./mill -i website.fastPages + website.checkBrokenLinks
@@ -101,7 +101,7 @@ jobs:
             millargs: "'example.thirdparty[{jimfs,commons-io}].native.daemon'"
             java-version: 24
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with: { fetch-depth: 1 }
 
       - uses: ./.github/actions/pre-build-setup