chore: bump google-genai min version to 1.59.0

PiperOrigin-RevId: 856791472

Author: speedstorm1

.kokoro/presubmit/presubmit.cfg

@@ -5,7 +5,7 @@
 # Other Python version unit tests are run separately
 env_vars: {
     key: "NOX_SESSION"
-    value: "unit-3.9 lint lint_setup_py blacken cover"
+    value: "unit-3.10 lint lint_setup_py blacken cover"
 }
 
 # Run unit tests in parallel, splitting up by file

.kokoro/presubmit/unit_3-9.cfg

@@ -3,7 +3,7 @@
 # Run unit tests for Python 3.9
 env_vars: {
     key: "NOX_SESSION"
-    value: "unit-3.9"
+    value: "unit-3.10"
 }
 
 # Run unit tests in parallel, splitting up by file

noxfile.py

@@ -53,7 +53,7 @@
     "recommonmark",
 )
 
-UNIT_TEST_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+UNIT_TEST_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]
 UNIT_TEST_LANGCHAIN_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
 UNIT_TEST_AG2_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
 UNIT_TEST_LLAMA_INDEX_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]

owlbot.py

@@ -98,8 +98,8 @@
 
     templated_files = common.py_library(
         cov_level=98,
-        system_test_python_versions=["3.9"],
-        unit_test_python_versions=["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"],
+        system_test_python_versions=["3.10"],
+        unit_test_python_versions=["3.10", "3.11", "3.12", "3.13", "3.14"],
         unit_test_extras=["testing"],
         system_test_extras=["testing"],
         microgenerator=True,

setup.py

@@ -317,7 +317,7 @@
         "google-cloud-storage >= 2.10.0, < 4.0.0; python_version>='3.13'",
         "google-cloud-bigquery >= 1.15.0, < 4.0.0, !=3.20.0",
         "google-cloud-resource-manager >= 1.3.3, < 3.0.0",
-        "google-genai >= 1.37.0, <2.0.0",
+        "google-genai >= 1.59.0, <2.0.0",
     )
     + genai_requires,
     extras_require={