Update dependencies and add the "gradle-wrapper.properties" file which defines the gradle version.

build.gradle

@@ -1,11 +1,11 @@
 buildscript {
     ext {
-        springSecurityVersion = "5.4.6"
+        springSecurityVersion = "5.5.0"
     }
 }
 
 plugins {
-    id 'org.springframework.boot' version '2.4.5'
+    id 'org.springframework.boot' version '2.5.0'
     id 'io.spring.dependency-management' version '1.0.11.RELEASE'
     id 'java'
 }
@@ -34,13 +34,10 @@ dependencies {
     implementation group: 'com.google.guava', name: 'guava', version: '30.1.1-jre'
 
     implementation "org.projectlombok:lombok:1.18.20"
-    implementation 'com.google.code.gson:gson:2.8.6'
+    implementation 'com.google.code.gson:gson:2.8.7'
     implementation group: 'javax.validation', name: 'validation-api', version: '2.0.1.Final'
     implementation group: 'ch.qos.logback', name: 'logback-classic', version: '1.2.3'
-    implementation group: 'commons-io', name: 'commons-io', version: '2.8.0'
-
-    // https://mvnrepository.com/artifact/com.google.guava/guava
-    // implementation group: 'com.google.guava', name: 'guava', version: '30.1-jre' // It will be usefull later..
+    implementation group: 'commons-io', name: 'commons-io', version: '2.9.0'
 
     testImplementation group: 'org.springframework.security', name: 'spring-security-test', version: springSecurityVersion
     testImplementation 'org.springframework.boot:spring-boot-starter-test'

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists