Revert to Kotlin 1.4.21

Kotlin 1.4.21-2 seems to be a pre-release.

uhabits-android/build.gradle.kts

@@ -68,7 +68,7 @@ android {
 
 dependencies {
     val daggerVersion = "2.31.2"
-    val kotlinVersion = "1.4.21-2"
+    val kotlinVersion = "1.4.21"
     val kxCoroutinesVersion = "1.4.2"
     val ktorVersion = "1.5.0"
     val espressoVersion = "3.3.0"

uhabits-core/build.gradle.kts

@@ -45,7 +45,7 @@ kotlin {
                 implementation(kotlin("stdlib-jdk8"))
                 compileOnly("com.google.dagger:dagger:2.31.2")
                 implementation("com.google.guava:guava:30.0-jre")
-                implementation("org.jetbrains.kotlin:kotlin-stdlib:1.4.21-2")
+                implementation("org.jetbrains.kotlin:kotlin-stdlib:1.4.21")
                 implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.4.2")
                 implementation("androidx.annotation:annotation:1.1.0")
                 implementation("com.google.code.findbugs:jsr305:3.0.2")

uhabits-server/build.gradle.kts

@@ -34,7 +34,7 @@ application {
 
 dependencies {
     val ktorVersion = "1.5.0"
-    val kotlinVersion = "1.4.21-2"
+    val kotlinVersion = "1.4.21"
     val logbackVersion = "1.2.3"
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlinVersion")
     implementation("io.ktor:ktor-server-netty:$ktorVersion")