Bump org.jetbrains.kotlin:kotlin-stdlib-jdk8 from 2.0.20 to 2.0.21

Bumps [org.jetbrains.kotlin:kotlin-stdlib-jdk8](https://github.com/JetBrains/kotlin) from 2.0.20 to 2.0.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.0.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib-jdk8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

app/build.gradle

@@ -49,7 +49,7 @@ android {
 
 dependencies {
     //noinspection DifferentStdlibGradleVersion
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.0.20"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:2.0.21"
     implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.8.6'
     implementation 'androidx.preference:preference:1.2.1'
     compileOnly project(':shell-loader:stub')