Downgrade to Checkstyle 9.3

Closes: #105

Author: mdeinum

spring-batch-excel/pom.xml

@@ -161,7 +161,7 @@
 					<dependency>
 						<groupId>com.puppycrawl.tools</groupId>
 						<artifactId>checkstyle</artifactId>
-						<version>10.5.0</version>
+						<version>9.3</version>
 					</dependency>
 					<dependency>
 						<groupId>io.spring.javaformat</groupId>