Bump python from `a3ddbd9` to `9c84459` in /docker (from PR #2166)
Bump python from `a3ddbd9` to `9c84459` in /docker (from PR #2166)

Bumps python from `a3ddbd9` to `9c84459`.

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

mozilla-services/tecken,mozilla-services/tecken,mozilla-services/tecken,mozilla-services/tecken