Merge pull request #465 from digital-asset/python-version-bump

python: Bump versions.

Merge pull request #458 from digital-asset/python-fix-package-fetching

python: Fix a bug that required packages to be pre-fetched.

Merge pull request #452 from digital-asset/python-allow-interface-que…

…ries

python: Allow queries on interfaces.

Merge pull request #451 from digital-asset/python-bump-versions

python: Bump versions.

Merge pull request #424 from digital-asset/dependabot/pip/samples/pin…

…g-pong/urllib3-1.26.18

build(deps): bump urllib3 from 1.26.8 to 1.26.18 in /samples/ping-pong

Merge pull request #402 from digital-asset/python-choice-interface-ex…

…ercise

python: Add support for interface exercises.

Merge pull request #385 from digital-asset/python-better-interfaces-s…

…upport

python: Better support for interfaces.

Merge pull request #383 from digital-asset/python-more-interface-types

python: Adding more types related to interfaces.

Merge pull request #381 from digital-asset/python-support-dars-with-i…

…nterfaces

python: Support for DARs that contain interfaces.