Update org.jetbrains.kotlinx to 1.6.4

Closes gh-11556

dependencies/spring-security-dependencies.gradle

@@ -13,7 +13,7 @@ dependencies {
 	api platform("org.junit:junit-bom:5.8.2")
 	api platform("org.springframework.data:spring-data-bom:2021.2.0-M4")
 	api platform("org.jetbrains.kotlin:kotlin-bom:$kotlinVersion")
-	api platform("org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.6.1")
+	api platform("org.jetbrains.kotlinx:kotlinx-coroutines-bom:1.6.4")
 	api platform("com.fasterxml.jackson:jackson-bom:2.13.3")
 	constraints {
 		api "ch.qos.logback:logback-classic:1.2.11"