Allow tenacity<10 in test extra for google-adk 1.28

Author: aIbrahiim

sdks/python/setup.py

@@ -471,7 +471,8 @@ def get_portability_package_data():
               'parameterized>=0.7.1,<0.10.0',
               'pyhamcrest>=1.9,!=1.10.0,<3.0.0',
               'requests_mock>=1.7,<2.0',
-              'tenacity>=8.0.0,<9',
+              # google-adk 1.28+ requires tenacity>=9,<10 (conflicts with <9).
+              'tenacity>=8.0.0,<10',
               'pytest>=7.1.2,<9.0',
               'pytest-xdist>=2.5.0,<4',
               'pytest-timeout>=2.1.0,<3',