fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMGOOGLEGUAVA-5710356
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-5725787
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEPDFBOX-1088011
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEPDFBOX-1088012
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEPDFBOX-1304912
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEPDFBOX-1304913
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-1296075
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-2841508

pom.xml

@@ -9,7 +9,7 @@
     <version>1.0-SNAPSHOT</version>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <serenity.version>3.1.0</serenity.version>
+        <serenity.version>4.0.0</serenity.version>
         <serenity.jbehave.version>1.46.0</serenity.jbehave.version>
         <webdriver.driver>chrome</webdriver.driver>
     </properties>