Set minSdkVersion 23 and delete old encryption codes #814
+224
−408
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ref #769
Two updates are planned in flutter_secure_storage v10.
This PR is a cutout of only the part about updating the min sdk to 23.
Many of the problems associated with #769 are related to old encryption codes. On the other hand, the min sdk has been updated to 21 since flutter 3.22, so there is less reason to support older Android OS.
https://docs.flutter.dev/release/breaking-changes/android-kitkat-deprecation
For this reason, can we proceed with updating the min sdk and replacing EncryptedSharedPreferences separately?
If we can update the min sdk to 23 and release it as flutter_secure_storage v9.3.0, we can close the issue about the old encryption codes.