maint(android): resolve deprecated Gradle features

https://build.palaso.org/buildConfiguration/KeymanAndroid_Build/565702?buildTab=log&focusLine=2591&logView=flowAware&linesState=936.2530.2534.2537

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22:57:12  Committing changes
22:57:13 
22:57:13  [Incubating] Problems report is available at: file:///C:/BuildAgent/work/78a54344b259d3bb/keyman/android/KMAPro/build/reports/problems/problems-report.html
22:57:13 
22:57:13  Deprecated Gradle features were used in this build, making it incompatible with Gradle 9.0.
22:57:13 
22:57:13  You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.
22:57:13 
22:57:13  For more on this, please refer to https://docs.gradle.org/8.12/userguide/command_line_interface.html#sec:command_line_warnings in the Gradle documentation.
22:57:13 
22:57:13  BUILD SUCCESSFUL in 41s
```