feat: remove lodash dependency (#743)

Co-authored-by: Dominik Pschenitschni <mail@celement.de>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/743
Reviewed-by: konrad <k@knt.li>
Co-authored-by: dpschen <dpschen@noreply.kolaente.de>
Co-committed-by: dpschen <dpschen@noreply.kolaente.de>

src/models/teamMember.js

@@ -1,14 +1,11 @@
 import UserModel from './user'
-import merge from 'lodash/merge'
 
 export default class TeamMemberModel extends UserModel {
 	defaults() {
-		return merge(
-			super.defaults(),
-			{
-				admin: false,
-				teamId: 0,
-			},
-		)
+		return {
+			...super.defaults(),
+			admin: false,
+			teamId: 0,
+		}
 	}
 }