fix: dspace-api/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-DNSJAVA-7547404
- https://snyk.io/vuln/SNYK-JAVA-DNSJAVA-7547405
- https://snyk.io/vuln/SNYK-JAVA-SOFTWAREAMAZONION-6153869

dspace-api/pom.xml

@@ -632,7 +632,7 @@
         <dependency>
             <groupId>dnsjava</groupId>
             <artifactId>dnsjava</artifactId>
-            <version>2.1.7</version>
+            <version>3.6.0</version>
         </dependency>
 
         <dependency>
@@ -742,7 +742,7 @@
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-java-sdk-s3</artifactId>
-            <version>1.12.261</version>
+            <version>1.12.763</version>
         </dependency>
 
         <dependency>