Add "timestamp" attribute to seventeentrack (#47960)
* bump py17track to 3.0.1
* Make aiohttp ClientSession optional
as introduced in py17track v3.0.0 (https://github.com/bachya/py17track/releases/tag/3.0.0)
* Update manifest.json
* add new attribute timestamp
introduced in 3.1.0
* Update requirements.txt
* Update requirements_all.txt
* Update requirements.txt
* Update requirements_test_all.txt
* Update sensor.py
* Update sensor.py
* Update manifest.json
* provide timezone configuration
user config to pre-define timezone of package status timestamps
* Update requirements_all.txt
* Update requirements_test_all.txt
* linting
* use hass.config.time_zone
* Update sensor.py
* Update test_sensor.py
* Update test_sensor.py
* black
* Update manifest.json
* adjust changes to session param
* added test against latest dev branch
* make isort happy
* make black happy
* make flake8 happy
* make black happy
* bump to 3.2.1
* 3.2.1
* Update typing 15
993261e7f5