add validation-timeout to fix lost job scheduling bug

xxl-job-admin/src/main/resources/application.properties

@@ -38,6 +38,7 @@ spring.datasource.hikari.pool-name=HikariCP
 spring.datasource.hikari.max-lifetime=900000
 spring.datasource.hikari.connection-timeout=10000
 spring.datasource.hikari.connection-test-query=SELECT 1
+spring.datasource.hikari.validation-timeout=1000
 
 ### xxl-job, email
 spring.mail.host=smtp.qq.com