Update kotlin to v2.2.21 (#11)

renovate[bot] · web-flow · commit 5038e07f2a09 · 2025-10-25T12:19:42.000-07:00
Co-authored-by: renovate[bot] &lt;29139614+renovate[bot]@users.noreply.github.com&gt;
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-kotlin = "2.2.20"
+kotlin = "2.2.21"
 buildconfig = "5.7.0"
 shadow = "9.2.2"
 dokka = "2.1.0"
