chore(deps): Bump cryptography in /a2a/generic_agent

Bumps [cryptography](https://github.com/pyca/cryptography) from 48.0.0 to 49.0.0.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@48.0.0...49.0.0)

---
updated-dependencies:
- dependency-name: cryptography
  dependency-version: 49.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

a2a/generic_agent/pyproject.toml

@@ -23,7 +23,7 @@ dependencies = [
     "protobuf>=6.33.5",         # Indirect; prevents CVE-2026-0994
     "mcp>=1.28.1",              # Indirect; prevents CVE-2025-66416
     "aiohttp>=3.14.1",          # Indirect; prevents CVE-2026-34525, CVE-2026-34516, CVE-2026-34515, CVE-2026-22815
-    "cryptography>=48.0.0,<49", # Indirect; prevents CVE-2026-26007
+    "cryptography>=49.0.0,<50", # Indirect; prevents CVE-2026-26007
 ]
 
 [project.scripts]