Bump slf4j.version from 1.7.21 to 1.7.30 (#391)

Bumps `slf4j.version` from 1.7.21 to 1.7.30.

Updates `slf4j-log4j12` from 1.7.21 to 1.7.30
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](qos-ch/slf4j@v_1.7.21...v_1.7.30)

Updates `slf4j-api` from 1.6.6 to 1.7.30
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](qos-ch/slf4j@v_1.6.6...v_1.7.30)

Updates `jcl-over-slf4j` from 1.6.6 to 1.7.30
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](qos-ch/slf4j@v_1.6.6...v_1.7.30)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

hazelcast-integration/hibernate-2ndlevel-cache/pom.xml

@@ -49,7 +49,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-log4j12</artifactId>
-            <version>1.7.5</version>
+            <version>1.7.30</version>
         </dependency>
     </dependencies>
 </project>

hazelcast-integration/spring-security/pom.xml

@@ -24,7 +24,7 @@
         <org.springframework-version>3.2.8.RELEASE</org.springframework-version>
         <spring.security.version>3.2.3.RELEASE</spring.security.version>
         <org.aspectj-version>1.6.10</org.aspectj-version>
-        <org.slf4j-version>1.6.6</org.slf4j-version>
+        <org.slf4j-version>1.7.30</org.slf4j-version>
     </properties>
 
     <dependencies>