Fix create-botbuilder-parity-issues.yml workflow (#6322)

* Update .ps1 file to use coveralls.net v 3.0.0

* Drop dotnet from matrix repo

.github/workflows/create-botbuilder-parity-issues.yml

@@ -48,7 +48,7 @@ jobs:
 
     strategy:
       matrix:
-        repo: [dotnet, java, js, python]
+        repo: [java, js, python]
 
     steps:
       - run: echo "::notice ::Creating issue for ${{ matrix.repo }}"