Merge remote-tracking branch 'origin/dependabot/gradle/modules/postgresql/org.postgresql-postgresql-42.2.20' into combined-pr-branch

Author: rnorth

modules/postgresql/build.gradle

@@ -11,7 +11,7 @@ dependencies {
 
     testImplementation project(':jdbc-test')
     testImplementation project(':test-support')
-    testImplementation 'org.postgresql:postgresql:42.2.18'
+    testImplementation 'org.postgresql:postgresql:42.2.20'
 
     testImplementation testFixtures(project(':r2dbc'))
     testImplementation 'io.r2dbc:r2dbc-postgresql:0.8.5.RELEASE'