fixed deprecated warnings

refilc_mobile_ui/lib/screens/settings/modify_subject_names.dart

@@ -49,12 +49,12 @@ class MenuRenamedSubjects extends StatelessWidget {
         style: TextStyle(
             color: AppColors.of(context)
                 .text
-                .withOpacity(settings.renamedSubjectsEnabled ? 1.0 : .5)),
+                .withValues(alpha: settings.renamedSubjectsEnabled ? 1.0 : .5)),
       ),
       leading: settings.renamedSubjectsEnabled
           ? const Icon(FeatherIcons.penTool)
           : Icon(FeatherIcons.penTool,
-              color: AppColors.of(context).text.withOpacity(.25)),
+              color: AppColors.of(context).text.withValues(alpha: .25)),
       trailingDivider: true,
       trailing: Switch(
         onChanged: (v) async {
@@ -200,7 +200,8 @@ class _ModifySubjectNamesState extends State<ModifySubjectNames> {
                             .name,
                     style: Theme.of(context).textTheme.titleSmall!.copyWith(
                         fontWeight: FontWeight.w700,
-                        color: AppColors.of(context).text.withOpacity(0.75)),
+                        color:
+                            AppColors.of(context).text.withValues(alpha: 0.75)),
                     overflow: TextOverflow.ellipsis,
                     maxLines: 2,
                     textAlign: TextAlign.center,
@@ -330,7 +331,8 @@ class _ModifySubjectNamesState extends State<ModifySubjectNames> {
                         style: TextStyle(
                           fontWeight: FontWeight.w600,
                           fontSize: 18,
-                          color: AppColors.of(context).text.withOpacity(.85),
+                          color:
+                              AppColors.of(context).text.withValues(alpha: .85),
                         ),
                       ),
                     ),
@@ -414,7 +416,7 @@ class RenamedSubjectItem extends StatelessWidget {
       onTap: () {},
       leading: Icon(
           SubjectIcon.resolveVariant(subject: subject, context: context),
-          color: AppColors.of(context).text.withOpacity(.75)),
+          color: AppColors.of(context).text.withValues(alpha: .75)),
       title: InkWell(
         onTap: modifyCallback,
         child: Column(
@@ -425,7 +427,7 @@ class RenamedSubjectItem extends StatelessWidget {
               style: TextStyle(
                   fontWeight: FontWeight.w500,
                   fontSize: 14,
-                  color: AppColors.of(context).text.withOpacity(.75)),
+                  color: AppColors.of(context).text.withValues(alpha: .75)),
               maxLines: 1,
               overflow: TextOverflow.ellipsis,
             ),
@@ -441,7 +443,7 @@ class RenamedSubjectItem extends StatelessWidget {
       trailing: InkWell(
         onTap: removeCallback,
         child: Icon(FeatherIcons.trash,
-            color: AppColors.of(context).red.withOpacity(.75)),
+            color: AppColors.of(context).red.withValues(alpha: .75)),
       ),
     );
   }