Update google-ai-generativelanguage version (#665)

* Update setup.py

* Update version.py

Author: MarkDaoust

google/generativeai/version.py

@@ -14,4 +14,4 @@
 # limitations under the License.
 from __future__ import annotations
 
-__version__ = "0.8.3"
+__version__ = "0.8.4"

setup.py

@@ -42,7 +42,7 @@ def get_version():
     release_status = "Development Status :: 5 - Production/Stable"
 
 dependencies = [
-    "google-ai-generativelanguage==0.6.13",
+    "google-ai-generativelanguage==0.6.15",
     "google-api-core",
     "google-api-python-client",
     "google-auth>=2.15.0",  # 2.15 adds API key auth support