Bump kotlin-stdlib-jdk8 from 1.4.32 to 1.7.21

Bumps [kotlin-stdlib-jdk8](https://github.com/JetBrains/kotlin) from 1.4.32 to 1.7.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.4.32...v1.7.21)

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

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -28,7 +28,7 @@ repositories {
 apply plugin: "org.jlleitschuh.gradle.ktlint-idea"
 
 dependencies {
-    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.4.32")
+    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.7.21")
 
     testImplementation "org.hamcrest:hamcrest:2.2"
     testImplementation 'org.mockito:mockito-core:4.8.0'