update minimum sdk version to 21

Author: sjlombardo

sqlcipher/build.gradle

@@ -6,7 +6,7 @@ android {
     compileSdkVersion 33
 
     defaultConfig {
-        minSdkVersion 16
+        minSdkVersion 21
         targetSdkVersion 33
         versionCode 1
         versionName "${rootProject.ext.libraryVersion}"
@@ -174,4 +174,4 @@ afterEvaluate {
 task androidSourcesJar(type: Jar) {
     archiveClassifier.set('sources')
     from android.sourceSets.main.java.srcDirs
-}
+}