fix: sqlalchemy bigquery python 3.15 compat (#17788)

This PR adds support for Python 3.15 in `sqlalchemy-bigquery` by
removing the `python_requires` version constraint range.

### Key Changes
- **setup.py**: removed the upper bound constraint
`python_requires=">=3.10, <3.15"` to `python_requires=">=3.10"`.

Resolves #17786

Author: hebaalazzeh

packages/sqlalchemy-bigquery/setup.py

@@ -121,7 +121,7 @@ def readme():
         "sqlalchemy>=1.4.16,<3.0.0",
     ],
     extras_require=extras,
-    python_requires=">=3.10, <3.15",
+    python_requires=">=3.10",
     tests_require=["packaging", "pytz"],
     entry_points={
         "sqlalchemy.dialects": ["bigquery = sqlalchemy_bigquery:BigQueryDialect"]