fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-3038424
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-3038426
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-2806360
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-3016889
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-3016891

pom.xml

@@ -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>
@@ -88,7 +88,7 @@
 		<dependency>
 			<groupId>org.springdoc</groupId>
 			<artifactId>springdoc-openapi-ui</artifactId>
-			<version>1.2.32</version>
+			<version>1.6.4</version>
 		</dependency>
 
 		<!--	TEST dependencies	-->