[Snyk] Security upgrade org.postgresql:postgresql from 42.3.0 to 42.3.3

[kabat87]

Snyk has created this PR to fix 1 vulnerabilities in the maven dependencies of this project.

Snyk changed the following file(s):

• cloud-sql/postgres/servlet/pom.xml

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score	Upgrade
	Arbitrary Code Injection SNYK-JAVA-ORGPOSTGRESQL-2401816	726	org.postgresql:postgresql: 42.3.0 -> 42.3.3 Proof of Concept

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