chore(deps): Bump cryptography from 48.0.0 to 49.0.0 in /mcp/slack_tool

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]

mcp/slack_tool/pyproject.toml

@@ -12,5 +12,5 @@ dependencies = [
     "python-multipart>=0.0.32", # Indirect; prevents CVE-2026-24486
     "fastmcp>=3.4.4",           # Indirect; prevents CVE-2026-32871
     "starlette>=1.3.1",        # Indirect; prevents CVE-2025-62727
-    "cryptography>=48.0.0,<49", # Indirect; prevents CVE-2026-26007
+    "cryptography>=49.0.0,<50", # Indirect; prevents CVE-2026-26007
 ]