Build / Remove duplicate log4j-slf4j-impl dependency (#9264)

Removed log4j-slf4j-impl dependency from pom.xml.
```
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: org.apache.logging.log4j:log4j-slf4j-impl:jar -> duplicate declaration of version (?) @ line 72, column 17
```

Author: fxprunayre

web/pom.xml

@@ -57,10 +57,6 @@
       <groupId>com.zaxxer</groupId>
       <artifactId>HikariCP</artifactId>
     </dependency>
-    <dependency>
-      <groupId>org.apache.logging.log4j</groupId>
-      <artifactId>log4j-slf4j-impl</artifactId>
-    </dependency>
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-api</artifactId>