Merge pull request #552 from fwcd/lsp4j-0.21.2

Update LSP4J to 0.21.2

Author: fwcd

platform/build.gradle.kts

@@ -8,7 +8,7 @@ javaPlatform {
 
 val kotlinVersion = "1.9.20"
 val exposedVersion = "0.37.3"
-val lsp4jVersion = "0.15.0"
+val lsp4jVersion = "0.21.2"
 
 // constrain the dependencies that we use to these specific versions
 dependencies {