[Tech] Bump org.jlleitschuh.gradle.ktlint from 11.6.1 to 12.1.1 in /b…

…ackend (#3604)

Bumps org.jlleitschuh.gradle.ktlint from 11.6.1 to 12.1.1.


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backend/build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
     id("org.jetbrains.kotlin.plugin.allopen") version "1.9.22"
     kotlin("plugin.noarg") version "1.9.10"
     kotlin("plugin.jpa") version "2.0.0"
-    id("org.jlleitschuh.gradle.ktlint") version "11.6.1"
+    id("org.jlleitschuh.gradle.ktlint") version "12.1.1"
     kotlin("plugin.serialization") version "2.0.0"
 }