fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMGOOGLECODEGSON-1730327

pom.xml

@@ -55,7 +55,7 @@
 		<dependency>
 			<groupId>com.google.code.gson</groupId>
 			<artifactId>gson</artifactId>
-			<version>2.8.6</version>
+			<version>2.8.9</version>
 		</dependency>
 		<dependency>
 			<groupId>com.fasterxml.jackson.module</groupId>
@@ -72,7 +72,7 @@
 		<dependency>
 			<groupId>org.postgresql</groupId>
 			<artifactId>postgresql</artifactId>
-			<version>42.4.1</version>
+			<version>42.2.12</version>
 		</dependency>
 		<dependency>
 			<groupId>org.liquibase</groupId>