Release announcement:
https://www.python.org/downloads/release/python-3100/
https://blog.python.org/2021/10/python-3100-is-available.html

More detailsed "What's new":
https://docs.python.org/3.10/whatsnew/3.10.html

For this release, a new version of the buildpack's Python build script has been
added, which includes some long-overdue improvements:
- enables PGO (`--enable-optimizations`)
- enables loadable SQLite extensions (`--enable-loadable-sqlite-extensions`)
- enables strict configure option checking (`--enable-option-checking=fatal`)
- the make invocation now uses concurrency (!!)
- the test module cleanup step now also removes the `idle_test` directory

These bring our Python builds closer in-line with those used elsewhere, for example:
https://github.com/docker-library/python/blob/d65295b73bc2c711de96caeba17501d1a81b6a5c/3.9/buster/Dockerfile#L43-L45

For docs on the configure options, see:
https://docs.python.org/3.10/using/configure.html

Fixes #488.
GUS-W-8060029.
GUS-W-9093281.