Bump actions/setup-dotnet from 2 to 4

Bumps [actions/setup-dotnet](https://github.com/actions/setup-dotnet) from 2 to 4.
- [Release notes](https://github.com/actions/setup-dotnet/releases)
- [Commits](actions/setup-dotnet@v2...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/main.yml

@@ -31,7 +31,7 @@ jobs:
       with:
         submodules: true
     - name: Setup .NET
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: 6.0.x
     - name: Restore dependencies
@@ -80,7 +80,7 @@ jobs:
       with: 
         submodules: true
     - name: Setup .NET
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: 6.0.x
     - name: Install Mac workload 
@@ -111,7 +111,7 @@ jobs:
       with: 
         submodules: true
     - name: Setup .NET
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: 6.0.x
     - name: Install Mac workload