fix: change the library from preview to stable (#267)

Author: sai-sunder-s

.repo-metadata.json

@@ -3,7 +3,7 @@
     "name_pretty": "Google Auth OAuthlib",
     "client_documentation": "https://googleapis.dev/python/google-auth-oauthlib/latest",
     "issue_tracker": "https://github.com/googleapis/google-auth-library-python-oauthlib/issues",
-    "release_level": "preview",
+    "release_level": "stable",
     "language": "python",
     "library_type": "AUTH",
     "repo": "googleapis/google-auth-library-python-oauthlib",

setup.py

@@ -56,7 +56,7 @@
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
-        "Development Status :: 3 - Alpha",
+        "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: Apache Software License",
         "Operating System :: POSIX",