Repackage to latest Python boilerplate

[Gadgetoid]

These changes repackage Display HAT Mini to the latest (experimental) Python boilerplate, which includes checks and enforcement for a virtual environment stored in ~/.virtualenvs/pimoroni.

Note: I have changed "pimoroni" to "tool.pimoroni" in pyproject.toml here, that should be merged upstream to the boilerplate. Upstream as of pimoroni/boilerplate-python@bd3bf8b

[github-actions]

Pull Request Test Coverage Report for Build 6615399294

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+32.4%) to 80.208%

---

Totals
Change from base Build 1794308786:	32.4%
Covered Lines:	77
Relevant Lines:	96

---

💛 - Coveralls

[helgibbons]

Working OK for me with Bookworm and Trixie!

git clone https://github.com/pimoroni/displayhatmini-python -b repackage
cd displayhatmini-python
./install.sh --unstable

I had to pip uninstall rpi-gpio and pip install rpi-lgpio to get the examples working on Pi 5.

[Gadgetoid]

I suspect this PR is now so old that a bunch of CI stuff has broken in the interim 😭

Will block out some time to update it!