Drop support for Python 3.10

[drbenvincent]

Current support is for:

CausalPy/.github/workflows/ci.yml

Line 14 in b264193

python-version: ["3.10", "3.11", "3.12"]

also see

CausalPy/pyproject.toml

Line 21 in b264193

requires-python = ">=3.10"

This is mostly inspired by me running into issues when working on supporting the Prior class from pymc-extras, see here.

We should drop support for 3.10 primarily because pymc-extras requires Python >=3.11.

We should probably also add support for 3.13.

3.14 is out soon, but not yet, so we don't need to add support for that yet.