chore(deps): bump sgp4 from 2.25 to 2.26 in /backend

Bumps [sgp4](https://github.com/brandon-rhodes/python-sgp4) from 2.25 to 2.26.
- [Commits](https://github.com/brandon-rhodes/python-sgp4/compare/2.25...2.26)

---
updated-dependencies:
- dependency-name: sgp4
  dependency-version: '2.26'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

backend/pyproject.toml

@@ -27,7 +27,7 @@ dependencies = [
     "requests==2.33.0",
     "PySocks==1.7.1",
     "reverse-geocoder==1.5.1",
-    "sgp4==2.25",
+    "sgp4==2.26",
     "meshtastic>=2.5.0",
     "networkx>=3.4.0",
     "numpy>=2.2.0",