Bump io.ktor:ktor-bom from 2.0.3 to 2.3.1 in /server/app

Bumps [io.ktor:ktor-bom](https://github.com/ktorio/ktor) from 2.0.3 to 2.3.1.
- [Release notes](https://github.com/ktorio/ktor/releases)
- [Changelog](https://github.com/ktorio/ktor/blob/main/CHANGELOG.md)
- [Commits](ktorio/ktor@2.0.3...2.3.1)

---
updated-dependencies:
- dependency-name: io.ktor:ktor-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

server/app/build.gradle.kts

@@ -16,7 +16,7 @@ repositories {
 dependencies {
     implementation(platform("org.jetbrains.kotlin:kotlin-bom"))
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
-    implementation(platform("io.ktor:ktor-bom:2.0.3"))
+    implementation(platform("io.ktor:ktor-bom:2.3.1"))
     implementation("io.ktor:ktor-server-core")
     implementation("io.ktor:ktor-server-cors")
     implementation("io.ktor:ktor-server-content-negotiation")