CI/CD: Upgrade codecov github action from deprecated v1 to v3

Author: zoj613

.github/workflows/build-and-test.yml

@@ -40,7 +40,7 @@ jobs:
           pytest -v --cov-branch --cov=polyagamma tests/ --cov-report=xml
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v3
         with:
           files: ./coverage.xml
-          fail_ci_if_error: true
+          fail_ci_if_error: false