Update .readthedocs.yaml

[dalcinl]

• Use ubuntu-lts-latest VM image
• Use Python 3.14

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.84%. Comparing base (e5c72a3) to head (9f4ab6b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #70   +/-   ##
=======================================
  Coverage   76.84%   76.84%           
=======================================
  Files          16       16           
  Lines        3532     3532           
  Branches      465      465           
=======================================
  Hits         2714     2714           
  Misses        660      660           
  Partials      158      158           

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[dalcinl]

Looks like https://docs.scipy.org/doc/scipy/ is currently down or very slow, making the RTD build fail with

WARNING: failed to reach any of the inventories with the following issues:
intersphinx inventory 'https://docs.scipy.org/doc/scipy/objects.inv' not fetchable due to <class 'requests.exceptions.ConnectTimeout'>: HTTPSConnectionPool(host='docs.scipy.org', port=443): Max retries exceeded with url: /doc/scipy/objects.inv (Caused by ConnectTimeoutError(<HTTPSConnection(host='docs.scipy.org', port=443) at 0x76145a2a79d0>, 'Connection to docs.scipy.org timed out. (connect timeout=None)'))