update druid 1.2.9 => 1.2.11

pom.xml

@@ -20,7 +20,7 @@
         <java.version>1.8</java.version>
         <maven-jar-plugin.version>3.2.2</maven-jar-plugin.version>
         <spring-boot.mybatis>2.2.2</spring-boot.mybatis>
-        <druid.version>1.2.9</druid.version>
+        <druid.version>1.2.11</druid.version>
         <knife4j.version>3.0.3</knife4j.version>
         <swagger-annotations.version>1.5.22</swagger-annotations.version>
         <poi.version>5.2.2</poi.version>