Bump javalinOpenApi from 5.5.0-1 to 5.6.1 in /reposilite-backend (#1862)

Bumps `javalinOpenApi` from 5.5.0-1 to 5.6.1.

Updates `io.javalin.community.openapi:javalin-openapi-plugin` from 5.5.0-1 to 5.6.1
- [Release notes](https://github.com/javalin/javalin-openapi/releases)
- [Commits](javalin/javalin-openapi@5.5.0-1...5.6.1)

Updates `io.javalin.community.openapi:openapi-annotation-processor` from 5.5.0-1 to 5.6.1
- [Release notes](https://github.com/javalin/javalin-openapi/releases)
- [Commits](javalin/javalin-openapi@5.5.0-1...5.6.1)

---
updated-dependencies:
- dependency-name: io.javalin.community.openapi:javalin-openapi-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: io.javalin.community.openapi:openapi-annotation-processor
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

reposilite-backend/build.gradle.kts

@@ -46,7 +46,7 @@ dependencies {
     api("io.javalin:javalin:$javalin")
     api("io.javalin.community.ssl:ssl-plugin:$javalin")
 
-    val javalinOpenApi = "5.5.0-1"
+    val javalinOpenApi = "5.6.1"
     api("io.javalin.community.openapi:javalin-openapi-plugin:$javalinOpenApi")
     kapt("io.javalin.community.openapi:openapi-annotation-processor:$javalinOpenApi")