Uplifted GSON dependency version to 2.9.1 (#309)

* Excluded the logback-classic dependency

* Merged log4j to slf4j changes.

* uplifted gson dependency version from 2.8.4 to 2.9.1

* Removed older changes related to logback-classic

* Uplifted pom.xml version from 3.0.2 to 3.0.3

Co-authored-by: Shubham Gupta C <shubham.c.gupta@ericsson.com>

Author: shubhamkumarguptaTCS

pom.xml

@@ -6,7 +6,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.github.ericsson</groupId>
     <artifactId>eiffel-intelligence-frontend</artifactId>
-    <version>3.0.2</version>
+    <version>3.0.3</version>
     <packaging>war</packaging>
 
     <parent>
@@ -116,7 +116,7 @@
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.4</version>
+            <version>2.9.1</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/junit/junit -->
         <dependency>