fix: VM-Core/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEPDFBOX-1304912
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEPDFBOX-1304913

Author: snyk-bot

VM-Core/pom.xml

@@ -303,7 +303,7 @@
     <properties>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
-        <pdfbox.version>2.0.16</pdfbox.version>
+        <pdfbox.version>2.0.24</pdfbox.version>
         <jacoco.version>0.7.9</jacoco.version>
         <jacoco.outputDir>${project.basedir}/target/jacoco.exec</jacoco.outputDir>
     </properties>