Updating .NET to the highest 6.x version (6.0.427)

Author: BenedekFarkas

.github/workflows/build-and-test.yml

@@ -19,7 +19,7 @@ jobs:
       build-configuration: Debug
       build-enable-nuget-caching: 'true'
       build-enable-npm-caching: 'true'
-      dotnet-version: 6.0.100
+      dotnet-version: 6.0.427
 
   build-and-test-standard-runners:
     if: github.ref_name == github.event.repository.default_branch
@@ -30,7 +30,7 @@ jobs:
       machine-types: "['ubuntu-2404']"
       timeout-minutes: 30
       build-configuration: Debug
-      dotnet-version: 6.0.100
+      dotnet-version: 6.0.427
 
   build-and-test-nuget-test:
     name: Build and Test - NuGetTest solution
@@ -40,7 +40,7 @@ jobs:
       machine-types: "['ubuntu-2404']"
       build-directory: NuGetTest
       timeout-minutes: 10
-      dotnet-version: 6.0.100
+      dotnet-version: 6.0.427
 
   post-pull-request-checks-automation:
     name: Post Pull Request Checks Automation