chore(deps): 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/scala-cli-update.yml

@@ -7,7 +7,7 @@ jobs:
   build: 
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ssh-key: ${{ secrets.SCALA_CLI_SETUP_INTERNAL_KEY }}
           ref: main

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
         os: [ubuntu-latest, macOS-13, macOS-latest, windows-latest]
         jvm: ['temurin:17']
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Setup Node.js
       uses: actions/setup-node@v6

.github/workflows/update-dist.yml

@@ -8,7 +8,7 @@ jobs:
   update-dist:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Node.js
         uses: actions/setup-node@v6
         with: