[Snyk] Fix for 5 vulnerabilities

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `maven` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	696/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.5	Server-side Template Injection (SSTI) SNYK-JAVA-ORGFREEMARKER-1076795	org.freemarker:freemarker: 2.3.28 -> 2.3.30	No	Proof of Concept
	644/1000 Why? Has a fix available, CVSS 8.6	Improper Input Validation SNYK-JAVA-ORGSPRINGFRAMEWORK-1009832	org.springframework:spring-web: 5.1.0.RELEASE -> 5.2.15.RELEASE	No	No Known Exploit
	434/1000 Why? Has a fix available, CVSS 4.4	Privilege Escalation SNYK-JAVA-ORGSPRINGFRAMEWORK-1296829	org.springframework:spring-web: 5.1.0.RELEASE -> 5.2.15.RELEASE	No	No Known Exploit
	721/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 8	Reflected File Download (RFD) SNYK-JAVA-ORGSPRINGFRAMEWORK-559346	org.springframework:spring-web: 5.1.0.RELEASE -> 5.2.15.RELEASE	No	Proof of Concept
	399/1000 Why? Has a fix available, CVSS 3.7	Denial of Service (DoS) SNYK-JAVA-ORGSPRINGFRAMEWORK-72470	org.springframework:spring-web: 5.1.0.RELEASE -> 5.2.15.RELEASE	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Denial of Service (DoS) 🦉 Server-side Template Injection (SSTI)