chore(deps): update actions/setup-dotnet action to v4 (#121)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/operator-release.yml

@@ -14,7 +14,7 @@ jobs:
           fetch-depth: 1
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 6.0.100
 

.github/workflows/testing.yml

@@ -14,7 +14,7 @@ jobs:
           fetch-depth: 1
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v3
+        uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 6.0.100