fix(deps): update dependency io.javalin:javalin to v7

Author: renovate[bot]

build.gradle.kts

@@ -22,7 +22,7 @@ repositories {
 
 dependencies {
     implementation("org.xerial:sqlite-jdbc:3.51.0.0")
-    implementation("io.javalin:javalin:6.7.0")
+    implementation("io.javalin:javalin:7.0.0-alpha.1")
 
     implementation("com.google.code.gson:gson:2.13.2")
     implementation("ch.qos.logback:logback-classic:1.5.20")