fix(deps): update dependency org.postgresql:postgresql to v42.7.12 (#506)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

backend/build.gradle.kts

@@ -45,7 +45,7 @@ dependencies {
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.20.1")
 
     // Postgres Database
-    implementation("org.postgresql:postgresql:42.7.11")
+    implementation("org.postgresql:postgresql:42.7.12")
 
     // Caching with Ehcache https://www.ehcache.org/
     implementation("org.ehcache:ehcache:3.11.1")