Change report-coverage.sh in attempt to fix Azure

Recently sometimes Azure has failed with:

++ curl -s https://codecov.io/bash
bash: /dev/fd/63: No such file or directory

This attempts to fix this by modifying report-coverage.sh slightly.

Author: nicoddemus

scripts/report-coverage.sh

@@ -13,4 +13,5 @@ fi
 python -m coverage combine
 python -m coverage xml
 python -m coverage report -m
-bash <(curl -s https://codecov.io/bash) -Z -X gcov -X coveragepy -X search -X xcode -X gcovout -X fix -f coverage.xml
+curl -s https://codecov.io/bash -o codecov-upload.sh
+bash codecov-upload.sh -Z -X gcov -X coveragepy -X search -X xcode -X gcovout -X fix -f coverage.xml