Update to docker ls 0.5.0

Clearlydefined license value is 88
(https://clearlydefined.io/definitions/npm/npmjs/-/dockerfile-language-server-nodejs/0.5.0)

Use exec-maven-plugin 3.0.0 while at it.

Change-Id: I3379feb3a73812e976f1dd3b0ce974b422c1ae3f
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
Reviewed-on: https://git.eclipse.org/r/c/linuxtools/org.eclipse.linuxtools/+/183929
diff --git a/containers/org.eclipse.linuxtools.docker.editor.ls/pom.xml b/containers/org.eclipse.linuxtools.docker.editor.ls/pom.xml
index 406ff3c..7bc0ad2 100644
--- a/containers/org.eclipse.linuxtools.docker.editor.ls/pom.xml
+++ b/containers/org.eclipse.linuxtools.docker.editor.ls/pom.xml
@@ -27,7 +27,7 @@
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>exec-maven-plugin</artifactId>
-				<version>1.6.0</version>
+				<version>3.0.0</version>
 				<executions>
 					<execution>
 						<id>npm-install</id>
@@ -40,7 +40,7 @@
 							<arguments>
 								<arg>install</arg>
 								<arg>--no-bin-links</arg>
-								<arg>dockerfile-language-server-nodejs@0.4.1</arg>
+								<arg>dockerfile-language-server-nodejs@0.5.0</arg>
 							</arguments>
 							<workingDirectory>language-server/</workingDirectory>
 						</configuration>