build(deps): bump javalinVersion from 6.2.0 to 6.3.0

Bumps `javalinVersion` from 6.2.0 to 6.3.0.

Updates `io.javalin:javalin` from 6.2.0 to 6.3.0
- [Release notes](https://github.com/javalin/javalin/releases)
- [Commits](javalin/javalin@javalin-parent-6.2.0...javalin-parent-6.3.0)

Updates `io.javalin:javalin-testtools` from 6.2.0 to 6.3.0
- [Release notes](https://github.com/javalin/javalin/releases)
- [Commits](javalin/javalin@javalin-parent-6.2.0...javalin-parent-6.3.0)

---
updated-dependencies:
- dependency-name: io.javalin:javalin
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.javalin:javalin-testtools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle.kts

@@ -29,7 +29,7 @@ val tstypesImplementation: Configuration by
 
 dependencies {
     val mtsAsn1Version = "3800c8a165"
-    val javalinVersion = "6.2.0"
+    val javalinVersion = "6.3.0"
     val coroutinesVersion = "1.8.1"
     val kotlinxSerializationVer = "1.7.1"