[Snyk] Security upgrade com.sparkjava:spark-core from 2.7.2 to 2.9.4

[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	Denial of Service (DoS) SNYK-JAVA-ORGECLIPSEJETTY-1090340	com.sparkjava:spark-core: 2.7.2 -> 2.9.4	No	Proof of Concept
	349/1000 Why? Has a fix available, CVSS 2.7	Improper Input Validation SNYK-JAVA-ORGECLIPSEJETTY-2945452	com.sparkjava:spark-core: 2.7.2 -> 2.9.4	No	No Known Exploit
	349/1000 Why? Has a fix available, CVSS 2.7	Improper Input Validation SNYK-JAVA-ORGECLIPSEJETTY-2945453	com.sparkjava:spark-core: 2.7.2 -> 2.9.4	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Web Cache Poisoning SNYK-JAVA-ORGECLIPSEJETTY-32383	com.sparkjava:spark-core: 2.7.2 -> 2.9.4	No	No Known Exploit
	704/1000 Why? Has a fix available, CVSS 9.8	Authorization Bypass SNYK-JAVA-ORGECLIPSEJETTY-32384	com.sparkjava:spark-core: 2.7.2 -> 2.9.4	No	No Known Exploit
	479/1000 Why? Has a fix available, CVSS 5.3	Information Exposure SNYK-JAVA-ORGECLIPSEJETTY-461008	com.sparkjava:spark-core: 2.7.2 -> 2.9.4	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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