Update merge path for lcov

Author: tidyui

.github/workflows/dotnet.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Build
       run: dotnet build --no-restore
     - name: Test
-      run: dotnet test --no-build -s build/tests.runsettings --no-build --verbosity normal /p:CollectCoverage=true /p:CoverletOutputFormat=\"json,lcov\" /p:MergeWith=../../coverage/lcov.json /p:CoverletOutput=../../coverage/lcov
+      run: dotnet test --no-build -s build/tests.runsettings --no-build --verbosity normal /p:CollectCoverage=true /p:CoverletOutputFormat=\"json,lcov\" /p:MergeWith=../../coverage/lcov.net9.0.json /p:CoverletOutput=../../coverage/lcov
     - name: Coveralls
       uses: coverallsapp/github-action@master
       with: