Remove mavenLocal()

The build failed locally (uses `mavenLocal()`), but passed with
GitHub Actions (uses `mavenCentral()`). [This
discussion](https://slack-chats.kotlinlang.org/t/2153020/is-anyone-else-suddenly-experiencing-failures-like-unable-to)
served as an indicator for me. Apparently, it seems like
`mavenLocal()` generally [should be
avoided](https://docs.gradle.org/current/userguide/declaring_repositories.html#sec:case-for-maven-local).

build.gradle.kts

@@ -7,7 +7,6 @@ java {
 }
 
 repositories {
-	mavenLocal()
 	mavenCentral()
 }