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] <support@github.com>

Author: dependabot[bot]

.github/workflows/antora.yml

@@ -34,7 +34,7 @@ jobs:
           sudo echo "127.0.0.1 repo.scala-sbt.org" | sudo tee -a /etc/hosts
           sudo echo "127.0.0.1 repo.typesafe.com" | sudo tee -a /etc/hosts
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # we don't know what commit the last tag was it's safer to get entire repo so previousStableVersion resolves
           fetch-depth: 0

.github/workflows/binary-check.yml

@@ -42,7 +42,7 @@ jobs:
           sudo echo "127.0.0.1 repo.scala-sbt.org" | sudo tee -a /etc/hosts
           sudo echo "127.0.0.1 repo.typesafe.com" | sudo tee -a /etc/hosts
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # we don't know what commit the last tag was it's safer to get entire repo so previousStableVersion resolves
           fetch-depth: 0

.github/workflows/cmd.yml

@@ -109,7 +109,7 @@ jobs:
           sudo echo "127.0.0.1 repo.scala-sbt.org" | sudo tee -a /etc/hosts
           sudo echo "127.0.0.1 repo.typesafe.com" | sudo tee -a /etc/hosts
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # we don't know what commit the last tag was it's safer to get entire repo so previousStableVersion resolves
           fetch-depth: 0

.github/workflows/gradle-wrapper-validation.yml

@@ -18,7 +18,7 @@ jobs:
           sudo echo "127.0.0.1 repo.scala-sbt.org" | sudo tee -a /etc/hosts
           sudo echo "127.0.0.1 repo.typesafe.com" | sudo tee -a /etc/hosts
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # we don't know what commit the last tag was it's safer to get entire repo so previousStableVersion resolves
           fetch-depth: 0

.github/workflows/publish.yml

@@ -43,7 +43,7 @@ jobs:
           sudo echo "127.0.0.1 repo.scala-sbt.org" | sudo tee -a /etc/hosts
           sudo echo "127.0.0.1 repo.typesafe.com" | sudo tee -a /etc/hosts
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # we don't know what commit the last tag was it's safer to get entire repo so previousStableVersion resolves
           fetch-depth: 0

.github/workflows/sync.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Run GitHub File Sync
         uses: BetaHuhn/repo-file-sync-action@v1
         with: