Add pip compile script to work around pip tools python version limitation #3868
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Description
Work around pip tools limitation where packages that depend on a certain Python version are not carried over into the requirements txt file when the command is run from a system with certain Python versions. The desire is for the txt file to act as a universal lock file for dependencies. This change appends necessary packages that only should be installed on Python < 3.9.
Implementation
The script unconditionally adds backports-zoneinfo under the assumption it's only run from Python 3.10+. We support 3.8, but I would expect developers to be using the Dockerfile defined version 3.10.
Related issues
Fixes ##3867