Use LemMinX 0.18.3

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

Author: rgrunber

package.json

@@ -16,7 +16,7 @@
     "dtd"
   ],
   "xmlServer": {
-    "version": "0.18.2"
+    "version": "0.18.3"
   },
   "binaryServerDownloadUrl": {
     "linux": "https://download.jboss.org/jbosstools/vscode/snapshots/lemminx-binary/LATEST/lemminx-linux.zip",