Run tests on Python 3.14; drop Python 3.10

[Tom-Willemsen]

Description of work

Test enabling Python 3.14 build; Drop python 3.10 support

Ticket

No ticket.

Acceptance criteria

• Pull request title is understandable for a user (e.g. scientist) reading the release notes. The PR title should be a short description of the change from a user perspective.
• Pull request has appropriate labels for automatic release-notes generation
• CI builds pass

Documentation

N/a - python version changes only.

[Tom-Willemsen]

This isn't going to work at the moment for various reasons - pydantic-numpy, epicscorelibs, and various others would need a 3.14 release. Will leave this PR open to track progress on 3.14 compatibility.