fix: Update to use proper username field

Resolves #108 (closed)

src/main/java/org/eclipsefoundation/git/eca/api/models/GitlabUserResponse.java

@@ -21,7 +21,7 @@ public abstract class GitlabUserResponse {
     
     public abstract Integer getId();
 
-    public abstract String getName();
+    public abstract String getUsername();
 
     public static Builder builder() {
         return new AutoValue_GitlabUserResponse.Builder();
@@ -32,7 +32,7 @@ public abstract class GitlabUserResponse {
     public abstract static class Builder {
         public abstract Builder setId(Integer id);
 
-        public abstract Builder setName(String name);
+        public abstract Builder setUsername(String username);
 
         public abstract GitlabUserResponse build();
     }