Update kotlin to v2.2.21 (#17)

renovate[bot] · web-flow · commit f781b0cfdc61 · 2025-10-25T12:20:12.000-07:00
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"
 ksp = "2.2.20-2.0.3"
 kotlinx-serialization = "1.9.0"
 buildconfig = "5.7.0"
