Bump org.jetbrains.gradle.plugin.idea-ext from 1.1.8 to 1.2 (#480)

Bumps org.jetbrains.gradle.plugin.idea-ext from 1.1.8 to 1.2.

---
updated-dependencies:
- dependency-name: org.jetbrains.gradle.plugin.idea-ext
  dependency-version: '1.2'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

gradle/libs.versions.toml

@@ -34,7 +34,7 @@ brigadier = "1.0.18"
 dgt = "2.48.0"
 kotlinx-abi = "0.17.0"
 licenser = "2.1.1"
-jetbrains-idea-ext = "1.1.8"
+jetbrains-idea-ext = "1.2"
 
 log4j-api = "2.0-beta9" # used because this is the version that 1.8.9 supports, so we have to compile against the same (annoying)