Update postgresql to 42.7.8

Author: aiven-scala-steward[bot]

build.sbt

@@ -18,7 +18,7 @@ val kafkaClientsVersion         = "3.7.0"
 val pekkoConnectorsVersion      = "1.0.2"
 val futilesVersion              = "2.0.2"
 val quillJdbcMonixVersion       = "3.7.2"
-val postgresqlJdbcVersion       = "42.7.3"
+val postgresqlJdbcVersion       = "42.7.8"
 val scalaLoggingVersion         = "3.9.5"
 val logbackClassicVersion       = "1.5.6"
 val declineVersion              = "2.4.1"