fix: pom.xml to reduce vulnerabilities
fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMGOOGLEGUAVA-32236
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEANT-1015405
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHETOMCAT-551994
- https://snyk.io/vuln/SNYK-JAVA-ORGCODEHAUSPLEXUS-31521
- https://snyk.io/vuln/SNYK-JAVA-ORGCODEHAUSPLEXUS-461102
leonardehrenfried/jspc-maven-plugin