chore: bump cryptography to ~=50.0

Move the cryptography requirement from ~=49.0 to ~=50.0 (>=50.0,<51.0)
and re-lock to 50.0.0. This clears CVE-2026-69247 / GHSA-g6cj-pr64-35w5
(PKCS#7 EnvelopedData decryption exposes a Bleichenbacher oracle),
which affects >=44.0.0,<50.0.0 and is fixed in 50.0.0.

The SDK only uses long-stable cryptography APIs (Fernet in session.py,
Cipher/algorithms/modes + default_backend in vault/_resource.py), which
are unchanged in the 50.x line.

Author: gjtorikian

pyproject.toml

@@ -8,7 +8,7 @@ authors = [{ name = "WorkOS", email = "sdk@workos.com" }]
 requires-python = ">=3.10"
 
 dependencies = [
-  "cryptography~=49.0",
+  "cryptography~=50.0",
   "httpx~=0.28",
   "pyjwt~=2.12",
   "typing_extensions~=4.0; python_version < '3.11'",