build(deps): bump ktVersion from 2.1.0 to 2.1.20 in /app

Bumps `ktVersion` from 2.1.0 to 2.1.20.

Updates `android` from 2.1.0 to 2.1.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.0...v2.1.20)

Updates `plugin.serialization` from 2.1.0 to 2.1.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.0...v2.1.20)

---
updated-dependencies:
- dependency-name: android
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: plugin.serialization
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

app/build.gradle.kts

@@ -5,7 +5,7 @@ import dev.zxilly.gradle.exec
 plugins {
     id("com.android.application") version "8.2.0"
 
-    val ktVersion = "2.1.0"
+    val ktVersion = "2.1.20"
 
     kotlin("android") version ktVersion
     kotlin("plugin.serialization") version ktVersion