[Snyk] Fix for 8 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
	589/1000 Why? Has a fix available, CVSS 7.5	Denial of Service (DoS) SNYK-JAVA-ORGAPACHEZOOKEEPER-31428		No	No Known Exploit
	479/1000 Why? Has a fix available, CVSS 5.3	Information Exposure SNYK-JAVA-ORGECLIPSEJETTY-174560	com.sparkjava:spark-core: 2.7.2 -> 2.9.1	No	No Known Exploit
	654/1000 Why? Has a fix available, CVSS 8.8	Session Hijacking SNYK-JAVA-ORGECLIPSEJETTY-32381	com.sparkjava:spark-core: 2.7.2 -> 2.9.1	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Cache Poisoning SNYK-JAVA-ORGECLIPSEJETTY-32383	com.sparkjava:spark-core: 2.7.2 -> 2.9.1	No	No Known Exploit
	704/1000 Why? Has a fix available, CVSS 9.8	Authorization Bypass SNYK-JAVA-ORGECLIPSEJETTY-32385	com.sparkjava:spark-core: 2.7.2 -> 2.9.1	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Cache Poisoning SNYK-JAVA-ORGECLIPSEJETTY-460763	com.sparkjava:spark-core: 2.7.2 -> 2.9.1	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 -> 2.9.1	No	No Known Exploit
	479/1000 Why? Has a fix available, CVSS 5.3	Information Exposure SNYK-JAVA-ORGECLIPSEJETTY-461009	com.sparkjava:spark-core: 2.7.2 -> 2.9.1	No	No Known Exploit

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

Vulnerabilities that could not be fixed

• Upgrade:
  • Could not upgrade org.apache.zookeeper:zookeeper@3.4.6 to org.apache.zookeeper:zookeeper@3.4.10; Reason could not apply upgrade, dependency is managed externally ; Location: https://maven-central.storage-download.googleapis.com/maven2/org/apache/curator/apache-curator/2.6.0/apache-curator-2.6.0.pom

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