Update checkstyle to version 8.13

pom.xml

@@ -618,6 +618,8 @@
     <commons.encoding>utf-8</commons.encoding>
 
     <checkstyle.plugin.version>3.0.0</checkstyle.plugin.version>
+    <checkstyle.version>8.13</checkstyle.version>
+
     <spotbugs.plugin.version>3.1.6</spotbugs.plugin.version>
     <japicmp.skip>false</japicmp.skip>
 
@@ -734,6 +736,13 @@
           <includeTestSourceDirectory>true</includeTestSourceDirectory>
           <enableRulesSummary>false</enableRulesSummary>
         </configuration>
+        <dependencies>
+          <dependency>
+            <groupId>com.puppycrawl.tools</groupId>
+            <artifactId>checkstyle</artifactId>
+            <version>${checkstyle.version}</version>
+          </dependency>
+        </dependencies>
       </plugin>
       <plugin>
         <groupId>com.github.spotbugs</groupId>

src/test/java/org/apache/commons/lang3/RandomStringUtilsTest.java

@@ -480,10 +480,21 @@ public class RandomStringUtilsTest {
             gen = RandomStringUtils.random(6,chars);
             for (int j = 0; j < 6; j++) {
                 switch (gen.charAt(j)) {
-                   case 'a': {counts[0]++; break;}
+                    case 'a': {
-                   case 'b': {counts[1]++; break;}
+                        counts[0]++;
-                   case 'c': {counts[2]++; break;}
+                        break;
-                   default: {fail("generated character not in set");}
+                    }
+                    case 'b': {
+                        counts[1]++;
+                        break;
+                    }
+                    case 'c': {
+                        counts[2]++;
+                        break;
+                    }
+                    default: {
+                        fail("generated character not in set");
+                    }
                 }
             }
         }