Update dotnet-stryker to version 3.4.0

Author: 0xced

.config/dotnet-tools.json

@@ -9,7 +9,7 @@
       ]
     },
     "dotnet-stryker": {
-      "version": "3.1.0",
+      "version": "3.4.0",
       "commands": [
         "dotnet-stryker"
       ]

.github/workflows/continuous-integration.yml

@@ -90,7 +90,6 @@ jobs:
       - name: Run mutation tests and upload report to Stryker dashboard
         if: matrix.os == 'ubuntu-latest' && env.STRYKER_DASHBOARD_API_KEY != ''
         run: |
-          cd tests
           dotnet tool restore
           dotnet tool run dotnet-stryker --reporter dashboard --version ${GITHUB_REF##*/} --dashboard-api-key ${{ secrets.STRYKER_DASHBOARD_API_KEY }}
       - name: Retrieve tag message