Upgrade to Postgresql 42.2.8

Closes gh-18406

Author: snicoll

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -146,7 +146,7 @@
 		<netty-tcnative.version>2.0.26.Final</netty-tcnative.version>
 		<nio-multipart-parser.version>1.1.0</nio-multipart-parser.version>
 		<pooled-jms.version>1.0.6</pooled-jms.version>
-		<postgresql.version>42.2.6</postgresql.version>
+		<postgresql.version>42.2.8</postgresql.version>
 		<prometheus-pushgateway.version>0.5.0</prometheus-pushgateway.version>
 		<quartz.version>2.3.1</quartz.version>
 		<querydsl.version>4.2.1</querydsl.version>