deps: bump org.jetbrains.kotlin.jvm in /telemetry/jetbrains

Bumps org.jetbrains.kotlin.jvm from 2.0.20 to 2.1.21.

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-version: 2.1.21
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

telemetry/jetbrains/gradle/libs.versions.toml

@@ -5,7 +5,7 @@ jlleitschuh-ktlint = "12.1.1"
 # deprecated; should move to json-skema
 jsonSchema = "1.14.4"
 junit5 = "5.11.3"
-kotlin = "2.0.20"
+kotlin = "2.1.21"
 kotlin-poet = "2.0.0"
 nexus = "2.0.0"