Merge branch 'update-log4j-versions' into 'master'

Update to 2.16 of log4j in indexer-azure

See merge request !252

provider/indexer-azure/pom.xml

@@ -37,7 +37,7 @@
         <azure.appservice.plan />
         <azure.appservice.appname />
         <azure.appservice.subscription />
-        <log4j.version>2.11.2</log4j.version>
+        <log4j.version>2.16.0</log4j.version>
         <nimbus-jose-jwt.version>8.2</nimbus-jose-jwt.version>
         <indexer-core.version>0.13.0-SNAPSHOT</indexer-core.version>
         <spring-security-jwt.version>1.1.1.RELEASE</spring-security-jwt.version>
@@ -118,6 +118,11 @@
             <artifactId>log4j-jul</artifactId>
             <version>${log4j.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-slf4j-impl</artifactId>
+            <version>${log4j.version}</version>
+        </dependency>
 
         <dependency>
             <groupId>com.nimbusds</groupId>