Updates the Postgresql JDBC driver to 42.7.1 to fix CVE-2025-49146. (#5935)

Signed-off-by: David Venable <dlv@amazon.com>
(cherry picked from commit eac98b3)

Author: dlvenable

data-prepper-plugins/rds-source/build.gradle

@@ -23,7 +23,7 @@ dependencies {
 
     implementation 'com.zendesk:mysql-binlog-connector-java:0.29.2'
     implementation 'com.mysql:mysql-connector-j:8.4.0'
-    implementation 'org.postgresql:postgresql:42.7.4'
+    implementation 'org.postgresql:postgresql:42.7.7'
 
     compileOnly 'org.projectlombok:lombok:1.18.20'
     annotationProcessor 'org.projectlombok:lombok:1.18.20'