Override reconfigure port for mocked cereal

Description

This is to address an issue where changing attributes such as the timeout, baudrate, etc. cause an exception when called with a cereal object.

Adds an override to pySerial's private _reconfigure_port method, to bypass pySerial attempting to configure hardware with cereal.
Test confirms that override works, removing the override will result in the call failing in pySerial's _reconfigure_port method.

[ ] 📚 Examples / docs / tutorials / dependencies update
[ ] 🔧 Bug fix (non-breaking change which fixes an issue)
[X] 🥂 Improvement (non-breaking change which improves an existing feature)
[ ] 🚀 New feature (non-breaking change which adds functionality)
[ ] 💥 Breaking change (fix or feature that would cause existing functionality to change)
[ ] 🔐 Security fix

[X] I've read the CODE_OF_CONDUCT.md document.
[X] I've read the [CONTRIBUTING.md]https://github.com/metergroup/GRANOLA/blob/main/CONTRIBUTING.md) guide.
[X] I've written tests for all new methods and classes that I created.
[X] I've written the docstring in Google format for all the methods and classes that I used.
[X] I've updated the code style using invoke style, and checked all my tests with invoke pytest or I have ran invoke all to accomplish both.