QuarkusConfigPropertiesProvider void return type check doesn't work

[AlexXuChen]

In QuarkusConfigPropertiesProvider, a method is checked for void return type:

quarkus-ls/quarkus.jdt.ext/com.redhat.microprofile.jdt.quarkus/src/main/java/com/redhat/microprofile/jdt/internal/quarkus/core/properties/QuarkusConfigPropertiesProvider.java

Line 180 in 9dd5a92

if ("Void()".equals(method.getReturnType())) {

but the void return check fails since the getReturnType string for void is simply "V".

We should use the fix in eclipse/lsp4mp#246 to resolve this issue.