Security: Update authlib to 1.6.5 (CVE-2025-61920) (#2347)

Updates authlib from 1.6.1 to 1.6.5 to address CVE-2025-61920, which
fixes a denial of service vulnerability in JOSE implementation that
accepts unbounded JWS/JWT header and signature segments.

Author: ColeMurray

pyproject.toml

@@ -12,7 +12,7 @@ dependencies = [
     "platformdirs>=4.0.0",
     "rich>=13.9.4",
     "cyclopts>=3.0.0",
-    "authlib>=1.5.2",
+    "authlib>=1.6.5",
     "pydantic[email]>=2.11.7",
     "pyperclip>=1.9.0",
     "py-key-value-aio[disk,keyring,memory]>=0.2.8,<0.3.0",