Revert "chore: use minSdk=23 for auth, and minSdk=21 for other modules (#2196)"

This reverts commit eca0ca3

Author: thatfiredev

app/build.gradle.kts

@@ -10,7 +10,7 @@ android {
     namespace = "com.firebase.uidemo"
 
     defaultConfig {
-        minSdk = 23
+        minSdk = Config.SdkVersions.min
         targetSdk = Config.SdkVersions.target
 
         versionName = Config.version

auth/build.gradle.kts

@@ -11,9 +11,8 @@ android {
     namespace = "com.firebase.ui.auth"
 
     defaultConfig {
-        // Auth requires a higher minSdk than the current Config.SdkVersions.min
-        minSdk = 23
-        targetSdk = Config.SdkVersions.target
+        minSdk = Config.SdkVersions.min
+        targetSdk =Config.SdkVersions.target
 
         buildConfigField("String", "VERSION_NAME", "\"${Config.version}\"")
 

buildSrc/src/main/kotlin/Config.kt

@@ -7,9 +7,7 @@ object Config {
     object SdkVersions {
         const val compile = 35
         const val target = 35
-        // Note that auth uses a different minSdk than this and
-        // should be changed in auth/build.gradle.kts
-        const val min = 21
+        const val min = 23
     }
 
     object Plugins {