Updating android.target doesn't invalidate target hash

Created by: raviagarwal7

Similar to the issue related to build tools version https://github.com/facebook/buck/issues/1953

╰─$ ./buckw targets <android-binary-target> --show-rulekey 
//apps/presidio/helix/app-apk:bin_exo 73dd03a0061c6bd0276016a3050db8eea44131b4 

╰─$ ./buckw targets <android-binary-target> --show-target-hash 
//apps/presidio/helix/app-apk:bin_exo 89377b6b9f943781b2ce7247dbac1bad 


╰─$ ./buckw targets <android-binary-target> --show-rulekey 
Invalidating internal cached state: Buck configuration options changed between invocations. This may cause slower builds. Changed value android.target='android-30' (was 'android-29') 
Parsing buck files: finished in 4.3 sec 
//apps/presidio/helix/app-apk:bin_exo a25fb63371d6a6c16f5851eeba0d710561b0cc91

╰─$ ./buckw targets <android-binary-target> --show-target-hash 
//apps/presidio/helix/app-apk:bin_exo 89377b6b9f943781b2ce7247dbac1bad