Bump zigpy-xbee from 0.14.0 to 0.20.2

Bumps [zigpy-xbee](https://github.com/zigpy/zigpy-xbee) from 0.14.0 to 0.20.2.
- [Release notes](https://github.com/zigpy/zigpy-xbee/releases)
- [Commits](zigpy/zigpy-xbee@0.14.0...0.20.2)

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

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

setup.py

@@ -23,7 +23,7 @@
         "bellows==0.29.0",
         "zha-quirks==0.0.72",
         "zigpy-deconz==0.16.0",
-        "zigpy-xbee==0.14.0",
+        "zigpy-xbee==0.20.2",
         "zigpy-zigate==0.8.0",
         "zigpy-znp==0.7.0",
     ],