Update backend dependencies.

backend/codiki-infrastructure/build.gradle.kts

@@ -7,5 +7,5 @@ dependencies {
     implementation(project(":codiki-domain"))
     implementation("org.springframework:spring-context")
     implementation("org.springframework.boot:spring-boot-starter-data-jpa")
-    implementation("org.postgresql:postgresql:42.7.5")
+    implementation("org.postgresql:postgresql:42.7.13")
 }