Remove double comma in Checkstyle configuration

See gh-45975

Signed-off-by: Nicolas Garea <nicogareacidre@gmail.com>

Author: nicolasgarea

src/checkstyle/checkstyle.xml

@@ -17,7 +17,7 @@
 				value="^sun.*, ^org\.apache\.commons\.(?!compress|dbcp2|logging|pool2).*, ^com\.datastax\.oss\.driver\.shaded.*, ^com\.google\.common.*, ^io\.micrometer\.core\.lang.*, ^io\.micrometer\.shaded.*, ^org\.jetbrains\.annotations.*, ^org\.testcontainers\.shaded.*,
 				^org\.apache\.commons\.compress\.utils" />
 			<property name="illegalClasses"
-				value="^com\.hazelcast\.util\.Base64, ^org\.junit\.rules\.ExpectedException, ^org\.mockito\.InjectMocks, ^org\.slf4j\.LoggerFactory, ^org.springframework.context.annotation.ScannedGenericBeanDefinition, , ^(?!org\.springframework\.core\.).*ResolvableType, ^(?!org\.springframework\.util\.).*ReflectionUtils, ^reactor\.core\.support\.Assert"/>
+				value="^com\.hazelcast\.util\.Base64, ^org\.junit\.rules\.ExpectedException, ^org\.mockito\.InjectMocks, ^org\.slf4j\.LoggerFactory, ^org.springframework.context.annotation.ScannedGenericBeanDefinition, ^(?!org\.springframework\.core\.).*ResolvableType, ^(?!org\.springframework\.util\.).*ReflectionUtils, ^reactor\.core\.support\.Assert"/>
 		</module>
 		<module
 			name="com.puppycrawl.tools.checkstyle.checks.imports.IllegalImportCheck">