⬆️ Bump org.flywaydb:flyway-database-postgresql in /backend

Bumps org.flywaydb:flyway-database-postgresql from 11.0.0 to 11.1.1.

---
updated-dependencies:
- dependency-name: org.flywaydb:flyway-database-postgresql
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

backend/build.gradle.kts

@@ -35,7 +35,7 @@ dependencies {
     implementation("org.jetbrains.kotlin:kotlin-reflect:2.0.21")
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin:2.18.2")
     implementation("org.flywaydb:flyway-core:11.0.0")
-    implementation("org.flywaydb:flyway-database-postgresql:11.0.0")
+    implementation("org.flywaydb:flyway-database-postgresql:11.1.1")
     implementation("com.github.ben-manes.caffeine:caffeine:3.1.8")
     implementation("io.jsonwebtoken:jjwt-api:0.12.6")
     implementation("io.jsonwebtoken:jjwt-impl:0.12.6")