GUACAMOLE-1594: Update all Java and JavaScript dependencies to latest compatible.

NOTE: Several WebPack plugins could not be updated as all plugins within
WebPack's "webpack-contrib" have dropped support for WebPack v4
entirely, but Closure Compiler only supports WebPack v4.

doc/licenses/slf4j-api-2.0.3/dep-coordinates.txt

@@ -0,0 +1,2 @@
+org.slf4j:jul-to-slf4j:jar:2.0.3
+org.slf4j:slf4j-api:jar:2.0.3