[Snyk] Security upgrade org.hibernate:hibernate-c3p0 from 4.3.11.Final to 5.4.19.Final

[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:
  • apollo-backend/pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	509/1000 Why? Has a fix available, CVSS 5.9	Denial of Service (DoS) SNYK-JAVA-COMMCHANGE-174481	org.hibernate:hibernate-c3p0: 4.3.11.Final -> 5.4.19.Final	Yes	No Known Exploit
	704/1000 Why? Has a fix available, CVSS 9.8	XML External Entity (XXE) Injection SNYK-JAVA-COMMCHANGE-451675	org.hibernate:hibernate-c3p0: 4.3.11.Final -> 5.4.19.Final	Yes	No Known Exploit
	619/1000 Why? Has a fix available, CVSS 8.1	SQL Injection SNYK-JAVA-ORGHIBERNATE-584563	org.hibernate:hibernate-c3p0: 4.3.11.Final -> 5.4.19.Final	Yes	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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