[Snyk] Fix for 2 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:
  • apollo-backend/pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	561/1000 Why? Recently disclosed, Has a fix available, CVSS 5.5	Information Disclosure SNYK-JAVA-COMGOOGLEGUAVA-1015415	com.github.spullara.mustache.java:compiler: 0.8.12 -> 0.9.0 com.google.guava:guava: 23.0 -> r03	No	No Known Exploit
	676/1000 Why? Recently disclosed, Has a fix available, CVSS 7.8	Privilege Escalation SNYK-JAVA-ORGECLIPSEJETTY-1021614	org.eclipse.jetty.websocket:javax-websocket-server-impl: 9.4.5.v20170502 -> 9.4.33.v20201020	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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