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] <support@github.com>

.github/workflows/dependabot-updates.yml

@@ -45,7 +45,7 @@ jobs:
           ref: ${{ github.head_ref }}
 
       - name: Setup .NET Core
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           dotnet-version: '3.1.x'
 

.github/workflows/dotnetcore.yml

@@ -22,7 +22,7 @@ jobs:
         fetch-depth: 0 # avoid shallow clone so nbgv can do its work.
 
     - name: Setup .NET Core
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: ${{ env.DOTNET_VERSION }}