Fixes CI: removes broken coverage, py3.8; addes py3.12

.github/workflows/continuous_integration.yml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
        os: [ubuntu-latest, macos-latest]
-       python-version: ["3.8", "3.9", "3.10", "3.11"]   
+       python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]   
     defaults:
       run:
         shell: bash -l {0}
@@ -42,13 +42,6 @@ jobs:
       - name: Test Python Package
         run: |
            pytest plio --cov-report=xml
-      - name: Upload Coverage
-        uses: codecov/codecov-action@v1
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
-          fail_ci_if_error: true
-          verbose: true
-        if: matrix.os == 'ubuntu-latest' && matrix.python-version == '3.8'
 
   Build-Docs:
     runs-on: ubuntu-latest