[Glitch] Enable ESLint react/no-deprecated

Port b878e3d8df to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/getting_started/index.jsx

@@ -96,7 +96,7 @@ class GettingStarted extends ImmutablePureComponent {
     openSettings: PropTypes.func.isRequired,
   };
 
-  componentWillMount () {
+  UNSAFE_componentWillMount () {
     this.props.fetchLists();
   }