Bump org.eclipse.lsp4j from 0.19.0 to 0.20.1

Bumps [org.eclipse.lsp4j](https://github.com/eclipse/lsp4j) from 0.19.0 to 0.20.1.
- [Release notes](https://github.com/eclipse/lsp4j/releases)
- [Changelog](https://github.com/eclipse/lsp4j/blob/main/CHANGELOG.md)
- [Commits](eclipse-lsp4j/lsp4j@v0.19.0...v0.20.1)

---
updated-dependencies:
- dependency-name: org.eclipse.lsp4j:org.eclipse.lsp4j
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -66,7 +66,7 @@
     <dependency>
       <groupId>org.eclipse.lsp4j</groupId>
       <artifactId>org.eclipse.lsp4j</artifactId>
-      <version>0.19.0</version>
+      <version>0.20.1</version>
     </dependency>
     <dependency>
       <groupId>com.vladsch.flexmark</groupId>