Update meshtastic requirement from ~=2.5.6 to ~=2.5.12

Updates the requirements on [meshtastic](https://github.com/meshtastic/python) to permit the latest version.
- [Release notes](https://github.com/meshtastic/python/releases)
- [Commits](meshtastic/python@2.5.6...2.5.12)

---
updated-dependencies:
- dependency-name: meshtastic
  dependency-type: direct:production
...

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

requirements.txt

@@ -4,7 +4,7 @@ flask~=3.1.0
 getmac==0.9.5
 haversine~=2.9.0
 humanize~=4.11.0
-meshtastic~=2.5.6
+meshtastic~=2.5.12
 openai==1.57.2
 paho-mqtt==2.1.0
 pylint==3.3.2