Increase the nightly keras version to 2.15.

The 2.14 release branch is cut at https://github.com/keras-team/keras/tree/r2.14.

PiperOrigin-RevId: 553299581

Author: qlzh727

keras/__init__.py

@@ -28,6 +28,6 @@
 from tensorflow.python import tf2
 from tensorflow.python.util.tf_export import keras_export
 
-__version__ = "2.14.0"
+__version__ = "2.15.0"
 
 keras_export("keras.__version__").export_constant(__name__, "__version__")

keras/tools/pip_package/setup.py

@@ -31,7 +31,7 @@
 # This version string is semver compatible, but incompatible with pip.
 # For pip, we will remove all '-' characters from this string, and use the
 # result for pip.
-_VERSION = "2.14.0"
+_VERSION = "2.15.0"
 
 REQUIRED_PACKAGES = [
     # We depend on TensorFlow's declared pip dependencies.
@@ -58,7 +58,7 @@
     packages=setuptools.find_packages(),
     install_requires=REQUIRED_PACKAGES,
     # Supported Python versions
-    python_requires=">=3.8",
+    python_requires=">=3.9",
     # PyPI package information.
     classifiers=[
         "Development Status :: 5 - Production/Stable",
@@ -67,7 +67,6 @@
         "Intended Audience :: Science/Research",
         "License :: OSI Approved :: Apache Software License",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",