Update plugin com.google.devtools.ksp to v2.0.21-1.0.25

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

app/build.gradle

@@ -31,7 +31,7 @@ plugins {
     id "org.jetbrains.kotlin.plugin.compose" version "2.0.20"
     id "com.diffplug.spotless" version "6.25.0"
     id "org.jetbrains.kotlin.kapt" version "2.0.20"
-    id 'com.google.devtools.ksp' version '2.0.20-1.0.25' apply false
+    id 'com.google.devtools.ksp' version '2.0.21-1.0.25' apply false
 }
 
 apply plugin: 'com.android.application'