Add LSP4J 0.20.0 to the target platform. (#473)

- JDT-LS now uses LSP4J 0.20.0, which is not available in Orbit or the
  main release repository

Signed-off-by: Roland Grunberg <rgrunber@redhat.com>

Author: rgrunber

pom.xml

@@ -154,9 +154,9 @@
     </profiles>
     <repositories>
         <repository>
-            <id>202112</id>
+            <id>202212</id>
             <layout>p2</layout>
-            <url>https://download.eclipse.org/releases/2021-12/202112081000/</url>
+            <url>https://download.eclipse.org/releases/2022-12/202212071000/</url>
         </repository>
         <repository>
             <id>oss.sonatype.org</id>
@@ -180,5 +180,10 @@
             <layout>p2</layout>
             <url>https://download.eclipse.org/tools/orbit/R-builds/R20170516192513/repository/</url>
         </repository>
+        <repository>
+            <id>lsp4j</id>
+            <layout>p2</layout>
+            <url>https://download.eclipse.org/lsp4j/updates/releases/0.20.0/</url>
+        </repository>
     </repositories>
 </project>