If we apply toolchain for all modules, they'll run tests on Java 8 instead of the JDK matrix on CI, we need to apply more toolchains in Test which will slow down the build, I believe we should not use toolchain for now. Check

• Configure languageVersion via toolchain detekt/detekt#5735

• dokka/.github/workflows/gradle-test.pr.yml

  Lines 12 to 13 in f5581c5

  	matrix:
  	version: [ 8, 11, 17 ]

Originally posted by @Goooler in #2704 (comment)