Bump meshtastic from 2.7.1 to 2.7.3

Bumps [meshtastic](https://github.com/meshtastic/python) from 2.7.1 to 2.7.3.
- [Release notes](https://github.com/meshtastic/python/releases)
- [Commits](meshtastic/python@2.7.1...2.7.3)

---
updated-dependencies:
- dependency-name: meshtastic
  dependency-version: 2.7.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -2,4 +2,4 @@ platformio==6.1.18
 nanopb==0.4.9.1
 grpcio-tools==1.74.0
 adafruit-nrfutil==0.5.3.post16
-meshtastic==2.7.1
+meshtastic==2.7.3