Update target platform to 4.38 (#607)

The 4.37 builds disappeared, breaking the build.

Author: mfussenegger

com.microsoft.java.debug.target/com.microsoft.java.debug.tp.target

@@ -2,7 +2,7 @@
     <locations>
         <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
             <unit id="org.eclipse.platform.feature.group" version="0.0.0"/>
-            <repository location="https://download.eclipse.org/eclipse/updates/4.37-I-builds/"/>
+            <repository location="https://download.eclipse.org/eclipse/updates/4.38-I-builds/"/>
         </location>
         <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
             <unit id="org.eclipse.jdt.ls.core" version="0.0.0"/>