docs: declare Python 3.14 supported in the docs

Author: dvarrazzo

NEWS

@@ -4,6 +4,7 @@ Current release
 What's new in psycopg 2.9.11
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+- Add support for Python 3.14.
 - `~psycopg2.errorcodes` map and `~psycopg2.errors` classes updated to
   PostgreSQL 18.
 - Drop support for Python 3.8.

doc/src/install.rst

@@ -131,7 +131,7 @@ The current `!psycopg2` implementation supports:
 ..
     NOTE: keep consistent with setup.py and the /features/ page.
 
-- Python versions from 3.9 to 3.13
+- Python versions from 3.9 to 3.14
 - PostgreSQL server versions from 7.4 to 18
 - PostgreSQL client library version from 9.1