fix: update poetry to v2 + add license to metadata

[cdce8p]

Poetry v2 was released last month. It added support for the [project] table in pyproject.toml.
https://python-poetry.org/blog/announcing-poetry-2.0.0/

One of the main advantages of v2 is that it's now possible to specify project.requires-python independently of tool.poetry.dependencies.python (which is used for locking). The latter only needs to be a subset of the former. This removes the need push a new release just to support the next Python version. bluetooth-adapters doesn't use any extensions itself, so it should be fine to remove the upper bound here.
https://python-poetry.org/docs/pyproject/#requires-python

Also added project.license.

Project metadata diff:

 ...
+License: Apache-2.0
-Requires-Python: >=3.9,<3.14
+Requires-Python: >=3.9
 ...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.05%. Comparing base (9050ac7) to head (c1ec7fc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #199   +/-   ##
=======================================
  Coverage   91.05%   91.05%           
=======================================
  Files          14       14           
  Lines         503      503           
  Branches       49       49           
=======================================
  Hits          458      458           
  Misses         36       36           
  Partials        9        9           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.