[Snyk] Fix for 3 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
	551/1000 Why? Recently disclosed, Has a fix available, CVSS 5.3	Denial of Service (DoS) SNYK-JAVA-ORGSPRINGFRAMEWORK-2434828	org.springframework:spring-context: 5.1.8.RELEASE -> 5.3.17	No	No Known Exploit
	957/1000 Why? Currently trending on Twitter, Mature exploit, Recently disclosed, Has a fix available, CVSS 9.8	Remote Code Execution SNYK-JAVA-ORGSPRINGFRAMEWORK-2436751	org.springframework:spring-context: 5.1.8.RELEASE -> 5.3.17	No	Mature
	676/1000 Why? Recently disclosed, Has a fix available, CVSS 7.8	Insecure Temporary File SNYK-JAVA-ORGSPRINGFRAMEWORKBOOT-2438287	org.springframework.boot:spring-boot-autoconfigure: 2.1.6.RELEASE -> 2.2.12.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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