Bump actions/setup-dotnet from 3 to 4

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 3 to 4.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v3...v4)

---
updated-dependencies:
- dependency-name: actions/setup-dotnet
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -24,7 +24,7 @@ jobs:
           path: ${{ env.FSHARP_DIR }}
           ref: main
       - name: Setup .NET for FSharp
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           global-json-file: ${{ env.FSHARP_DIR }}/global.json
       - name: Restore tools

.github/workflows/pr.yml

@@ -22,7 +22,7 @@ jobs:
           path: ${{ env.FSHARP_DIR }}
           ref: main
       - name: Setup .NET for FSharp
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           global-json-file: ${{ env.FSHARP_DIR }}/global.json
       - name: Restore tools