Bump snitun from 0.39.1 to 0.40.0

Bumps [snitun](https://github.com/NabuCasa/snitun) from 0.39.1 to 0.40.0.
- [Release notes](https://github.com/NabuCasa/snitun/releases)
- [Commits](NabuCasa/snitun@0.39.1...0.40.0)

---
updated-dependencies:
- dependency-name: snitun
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pyproject.toml

@@ -27,7 +27,7 @@ dependencies = [
     "cryptography>=42.0.0",
     "pycognito==2024.5.1",
     "PyJWT>=2.8.0",
-    "snitun==0.39.1",
+    "snitun==0.40.0",
     "webrtc-models<1.0.0",
 ]
 description = "Home Assistant cloud integration by Nabu Casa, Inc."