Update EF Core migration check command in workflow (#1031)

## Description

Describe your changes here.

Fixes #Issue_Number (if available)

### Ensure that your pull request has followed all the steps below:
- [ ] Code compilation
- [ ] Created tests which fail without the change (if possible)
- [ ] All tests passing
- [ ] Extended the README / documentation, if necessary

Author: BenjaminMichaelis

.github/workflows/PR-Build-And-Test.yml

@@ -38,7 +38,7 @@ jobs:
         run: dotnet build --configuration Release --no-restore /p:AccessToNugetFeed=false
 
       - name: Check for pending EF Core model changes
-        run: dotnet ef migrations has-pending-model-changes --project EssentialCSharp.Web --configuration Release --no-build
+        run: dotnet tool run dotnet-ef -- migrations has-pending-model-changes --project EssentialCSharp.Web --configuration Release --no-build
         env:
           ASPNETCORE_ENVIRONMENT: Development