[Snyk] Fix for 4 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
	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
	589/1000 Why? Has a fix available, CVSS 7.5	XML Entity Expansion SNYK-JAVA-ORGGLASSFISHJERSEYMEDIA-595972	org.glassfish.jersey.core:jersey-server: 2.23 -> 2.31	No	No Known Exploit
	619/1000 Why? Has a fix available, CVSS 8.1	Man-in-the-Middle (MitM) SNYK-JAVA-ORGPOSTGRESQL-173997	com.conveyal:gtfs-lib: 3.0.7 -> 3.0.10	No	No Known Exploit
	635/1000 Why? Has a fix available, CVSS 8.2	XML External Entity (XXE) Injection SNYK-JAVA-ORGPOSTGRESQL-571481	com.conveyal:gtfs-lib: 3.0.7 -> 3.0.10	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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