Update version to 0.23-dev and remove Python 3.8 support.

PiperOrigin-RevId: 570096139

Author: jburnim

setup.py

@@ -70,7 +70,7 @@ def has_ext_modules(self):
     url='http://github.com/tensorflow/probability',
     license='Apache 2.0',
     packages=find_packages(),
-    python_requires='>=3.8',
+    python_requires='>=3.9',
     install_requires=REQUIRED_PACKAGES,
     # Add in any packaged data.
     include_package_data=True,
@@ -88,7 +88,6 @@ def has_ext_modules(self):
         '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',

tensorflow_probability/python/__init__.py

@@ -51,7 +51,7 @@ def _validate_tf_environment(package):
   #
   # Update this whenever we need to depend on a newer TensorFlow release.
   #
-  required_tensorflow_version = '2.13'
+  required_tensorflow_version = '2.14'
 #   required_tensorflow_version = '1.15'  # Needed internally -- DisableOnExport
 
   if (distutils.version.LooseVersion(tf.__version__) <

tensorflow_probability/python/version.py

@@ -16,7 +16,7 @@
 
 # We follow Semantic Versioning (https://semver.org/)
 _MAJOR_VERSION = '0'
-_MINOR_VERSION = '22'
+_MINOR_VERSION = '23'
 _PATCH_VERSION = '0'
 
 # When building releases, we can update this value on the release branch to