Bump postgresql from 42.3.5 to 42.3.6

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.3.5 to 42.3.6.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](https://github.com/pgjdbc/pgjdbc/compare/REL42.3.5...REL42.3.6)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle

@@ -32,7 +32,7 @@ dependencies {
     implementation 'io.activej:activej-specializer:5.2'
     implementation 'io.activej:activej-launchers-http:5.2'
     implementation 'org.hsqldb:hsqldb:2.6.1'
-    implementation 'org.postgresql:postgresql:42.3.5'
+    implementation 'org.postgresql:postgresql:42.3.6'
     implementation 'org.hibernate:hibernate-core:5.6.7.Final'
     implementation 'org.hibernate:hibernate-hikaricp:5.6.7.Final'
     implementation 'com.zaxxer:HikariCP:5.0.1'