Print black and isort versions in CI for reproducing locally, so that formatting

can be fixed locally in accordance with the CI requirements. Without printing the
versions, we don't know what to install locally, and a different version may
suggest formatting that is not accepted by CI.

Author: srogatch

scripts/check_python_format.sh

@@ -5,6 +5,10 @@ ISORT="${ISORT:-isort}"
 
 set -eu
 
+# Know the specific versions used to reproduce the formatting checks locally
+${BLACK} --version
+${ISORT} --version
+
 GIT_ROOT=$(readlink -f $(dirname $0)/..)
 
 if [ $# -eq 0 ]; then