Update dependency no.nordicsemi.kotlin.ble:client-android to v2.0.0-alpha12

Author: renovate[bot]

gradle/nordic.versions.toml

@@ -4,7 +4,7 @@
 # The version catalog can be updated independently of this project after the release of this library.
 
 [versions]
-blek = "2.0.0-alpha10"
+blek = "2.0.0-alpha12"
 common = "2.6.2"
 
 [libraries]