prepare 9.0.1 release (#230)

## [9.0.1] - 2023-10-27
### Fixed:
- Replace deprecated `utcfromtimestamp` usage.

---------

Co-authored-by: Eli Bishop <eli@launchdarkly.com>
Co-authored-by: LaunchDarklyReleaseBot <launchdarklyreleasebot@launchdarkly.com>
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Co-authored-by: Christian Charukiewicz <christian@foxhound.systems>
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Author: 16 people

.readthedocs.yml

@@ -1,7 +1,11 @@
 version: 2
 
+build:
+  os: "ubuntu-22.04"
+  tools:
+    python: "3.8"
+
 python:
-  version: 3.8
   install:
     - requirements: docs/requirements.txt
     - requirements: requirements.txt

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 All notable changes to the LaunchDarkly Python SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [8.2.1] - 2023-10-23
+### Fixed:
+- Replace deprecated `utcfromtimestamp` usage.
+
 ## [9.0.0] - 2023-10-17
 The latest version of this SDK supports the ability to manage migrations or modernizations, using migration flags. You might use this functionality if you are optimizing queries, upgrading to new tech stacks, migrating from one database to another, or other similar technology changes. Migration flags are part of LaunchDarkly's Early Access Program. This feature is available to all LaunchDarkly customers but may undergo additional changes before it is finalized.
 

README.md

@@ -1,6 +1,7 @@
 # LaunchDarkly Server-side SDK for Python
 
 [![Circle CI](https://img.shields.io/circleci/project/launchdarkly/python-server-sdk.png)](https://circleci.com/gh/launchdarkly/python-server-sdk)
+[![readthedocs](https://readthedocs.org/projects/launchdarkly-python-sdk/badge/)](https://launchdarkly-python-sdk.readthedocs.io/en/latest/)
 
 [![PyPI](https://img.shields.io/pypi/v/launchdarkly-server-sdk.svg?maxAge=2592000)](https://pypi.python.org/pypi/launchdarkly-server-sdk)
 [![PyPI](https://img.shields.io/pypi/pyversions/launchdarkly-server-sdk.svg)](https://pypi.python.org/pypi/launchdarkly-server-sdk)

ldclient/impl/model/value_parsing.py

@@ -1,16 +1,16 @@
 import re
 from re import Pattern
 from semver import VersionInfo
-from datetime import tzinfo, timedelta, datetime
+from datetime import tzinfo, timedelta, datetime, timezone
 from numbers import Number
 from typing import Any, Optional
 
 import pyrfc3339
 
 _ZERO = timedelta(0)
 
-# A UTC class.
 
+# A UTC class.
 class _UTC(tzinfo):
     """UTC"""
 
@@ -23,7 +23,8 @@ def tzname(self, dt):
     def dst(self, dt):
         return _ZERO
 
-_epoch = datetime.utcfromtimestamp(0).replace(tzinfo=_UTC())
+
+_epoch = datetime.fromtimestamp(0, timezone.utc)
 
 
 def is_number(input: Any) -> bool: