New 'vehicle connected' binary sensor, bug fix & deprecation resolution

[zackslash]

Hi!

This pull request adds a new entity, fixes a bug and resolves some deprecation warnings.

• Adds a new binary sensor to indicate if a vehicle is connected to the charger (Using the same logic & endpoint as the app)
• Fixes a bug where some entities would become 'unavailable' and the integration need to be reloaded (Resolves Lock state unknown #16), this was due to the charging_time sensor being set to a state_class of 'total_increasing' while also defining 'last_reset' (this is unsupported in HA)
• Resolves a number of deprecation warnings for recent versions of home assistant (2024.12.1)

Im running this branch on my HA instance (2024.12.1), unit tests should be passing too. Happy to answer any questions or make changes from review

[zackslash]

The unit tests pass locally for me;

pytest -qq --timeout=9 --durations=10 -n auto --cov custom_components.eo_mini -o console_output_style=count -p no:sugar --asyncio-mode=auto tests

Would appreciate any pointers on how to get these passing in the project github 'pull' workflow.

[zackslash]

It looks like the python version in the pull workflow was outdated. Upgraded that + home assistant and now the tests all pass in the github pipeline

[twhittock]

My only real concern is the duplicate bugfix, thank you for your effort, it looks great!