Bump jvm from 2.0.255-SNAPSHOT to 2.1.20-Beta1 (#66)

Bumps jvm from 2.0.255-SNAPSHOT to 2.1.20-Beta1.

---
updated-dependencies:
- dependency-name: jvm
  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>

Author: dependabot[bot]

build.gradle.kts

@@ -1,5 +1,5 @@
 plugins {
-    kotlin("jvm") version "2.0.255-SNAPSHOT"
+    kotlin("jvm") version "2.1.20-Beta1"
     application
     id("com.github.johnrengelman.shadow") version "8.1.1"
     id("io.realm.kotlin") version "3.0.0"