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/docs.yml

@@ -17,9 +17,9 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Checkout fsharp main
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: dotnet/fsharp
           path: ${{ env.FSHARP_DIR }}

.github/workflows/pr.yml

@@ -12,9 +12,9 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Checkout fsharp main
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: dotnet/fsharp
           path: ${{ env.FSHARP_DIR }}