Update DiskCache.kt

Author: rli

plugins/core/jetbrains-community/src/software/aws/toolkits/jetbrains/core/credentials/sso/DiskCache.kt

@@ -32,7 +32,6 @@ import software.aws.toolkits.core.utils.touch
 import software.aws.toolkits.core.utils.tryDirOp
 import software.aws.toolkits.core.utils.tryFileOp
 import software.aws.toolkits.core.utils.tryOrNull
-import software.aws.toolkits.core.utils.warn
 import software.aws.toolkits.jetbrains.services.telemetry.scrubNames
 import software.aws.toolkits.telemetry.AuthTelemetry
 import software.aws.toolkits.telemetry.Result