[knx] Add breaking change alert (UoM)

Reference openhab/openhab-addons#14534.

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

distributions/openhab/src/main/resources/bin/update.lst

@@ -102,6 +102,7 @@ ALERT;JavaScript: JavaScript engines have changed their MIME types: NashornJS is
 ALERT;JavaScript NashornJS: NashornJS has been removed from core and isn't included by default. If you still need or want to use it, you can install it as an addon.
 ALERT;JavaScript Scripting Automation: The old "metadata" and "itemchannellink" APIs have been replaced by a new API with extended functionality on the "items" namespace.
 ALERT;JavaScript Scripting Automation: ItemHistory: historicState, maximumBetween, maximumSince, minimumBetween, minimumSince & previousState now return a HistoricItem instead of just the state. previousStateTimestamp has been removed, the timestamp is available on the HistoricItem.
+ALERT;KNX Binding: Units of Measurements have been introduced, make sure you use correct units in the state description. Rules may need to be adapted. Several items changed from PercentType to QuantityType, i.e. raw values increase by a factor of 100.
 ALERT;Netatmo Binding: Due to API authorization process change scheduled on the 2023/04/17 - refresh Token is no more stored in thing configuration, thus can be removed from things config files. If it remains, it'll be ignored.
 ALERT;Netatmo Binding: New scope has been added for the introduction of the Carbon Monoxide Alarm. Authorization process has to be replayed (and former refreshToken can be removed from things config files -- see above).