chore: upgrade cryptography to 50.0.1

Bump the upper bound on cryptography so Dependabot findings are fixed:
- GHSA-m959-cc7f-wv43 / CVE-2026-34073
- GHSA-79v4-65xg-pq4g / CVE-2024-12797
- CVE-2026-26007
- GHSA-jwv3-5hgf-82ww / CVE-2026-69249
- GHSA-m2h6-j472-rp4c
- GHSA-537c-gmf6-5ccf
- PYSEC-2026-3552 (fixed in 50.0.0)

All unit tests, ruff, and pyright pass on cryptography 50.0.1.

Author: luni

pyproject.toml

@@ -13,7 +13,7 @@ dependencies = [
     "apispec>=6.10.0",
     "marshmallow>=4.3.0",
     "aiohttp-apispec-acapy>=3.0.3",
-    "cryptography>=43.0.0,<44.0.0",
+    "cryptography>=43.0.0,<51.0.0",
 ]
 
 [dependency-groups]