[hibernate#2030] Upgrade PostgreSQL driver to 42.7.4

Author: DavideD

hibernate-reactive-core/build.gradle

@@ -46,7 +46,7 @@ dependencies {
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.11.3'
 
     // JDBC driver to test with ORM and PostgreSQL
-    testRuntimeOnly "org.postgresql:postgresql:42.7.3"
+    testRuntimeOnly "org.postgresql:postgresql:42.7.4"
 
     // JDBC driver for Testcontainers with MS SQL Server
     testRuntimeOnly "com.microsoft.sqlserver:mssql-jdbc:12.8.1.jre11"