Update dependency org.postgresql:postgresql to v42.7.8

Author: renovate[bot]

build.gradle

@@ -96,7 +96,7 @@ dependencies {
     implementation 'io.springfox:springfox-swagger2:3.0.0'
     implementation 'io.springfox:springfox-swagger-ui:3.0.0'
 
-    implementation 'org.postgresql:postgresql:42.3.6'
+    implementation 'org.postgresql:postgresql:42.7.8'
     implementation 'com.vladmihalcea:hibernate-types-52:2.8.0'
     implementation 'org.hibernate:hibernate-core:5.6.1.Final'
     //implementation 'org.apache.logging.log4j:log4j-api:2.13.2'