chore: Update Flutter and Yaru

.fvmrc

@@ -1,3 +1,3 @@
 {
-  "flutter": "3.24.3"
+  "flutter": "3.29.2"
 }

packages/app_center/lib/deb/deb_page.dart

@@ -10,7 +10,6 @@ import 'package:app_center/layout.dart';
 import 'package:app_center/packagekit/packagekit.dart';
 import 'package:app_center/widgets/widgets.dart';
 import 'package:appstream/appstream.dart';
-import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_html/flutter_html.dart';
@@ -203,7 +202,7 @@ class _DebActionButtons extends ConsumerWidget {
         else
           Text(l10n.debPageErrorNoPackageInfo),
         if (debModel.activeTransactionId != null) cancelButton,
-      ].whereNotNull().toList(),
+      ].nonNulls.toList(),
     );
   }
 }

packages/app_center/lib/games/games_page_featured.dart

@@ -98,8 +98,8 @@ class _CarouselCard extends StatelessWidget {
                   begin: Alignment.bottomCenter,
                   end: Alignment.topCenter,
                   colors: [
-                    Colors.black.withOpacity(1.0),
-                    Colors.black.withOpacity(0.2),
+                    Colors.black.withValues(alpha: 1.0),
+                    Colors.black.withValues(alpha: 0.2),
                   ],
                 ),
               ),

packages/app_center/lib/manage/manage_page.dart

@@ -468,7 +468,7 @@ class _MinHeightAsProgressIndicator extends StatelessWidget {
 }
 
 class _SmallLoadingIndicator extends StatelessWidget {
-  // ignore: unused_element
+  // ignore: unused_element_parameter
   const _SmallLoadingIndicator({this.progress});
 
   final double? progress;

packages/app_center/lib/snapd/snapd_cache.dart

@@ -75,7 +75,7 @@ mixin SnapdCache on SnapdClient {
         ),
       ),
     );
-    yield cachedSnaps.values.whereNotNull().toList();
+    yield cachedSnaps.values.nonNulls.toList();
 
     // Fetch and yield snaps from the store if necessary
     final writeToCache = <String, Snap>{};
@@ -101,7 +101,7 @@ mixin SnapdCache on SnapdClient {
         },
       ),
     );
-    yield storeSnaps.whereNotNull().toList();
+    yield storeSnaps.nonNulls.toList();
 
     // Save fetched snaps in the cache
     for (final e in writeToCache.entries) {

packages/app_center/lib/widgets/banner.dart

@@ -38,7 +38,7 @@ class CategoryBanner extends ConsumerWidget {
             .map(
               (name) => snaps?.singleWhereOrNull((snap) => snap.name == name),
             )
-            .whereNotNull()
+            .nonNulls
         : snaps;
     final l10n = AppLocalizations.of(context);
     return _Banner(

packages/app_center/lib/widgets/category_snap_list.dart

@@ -47,7 +47,7 @@ class CategorySnapList extends ConsumerWidget {
           (name) =>
               filteredSnaps?.singleWhereOrNull((snap) => snap.name == name),
         )
-        .whereNotNull();
+        .nonNulls;
 
     final snaps = (onlyFeatured ? featuredSnaps : filteredSnaps)
             ?.take(numberOfSnaps)

packages/app_center/lib/widgets/screenshot_gallery.dart

@@ -177,7 +177,7 @@ class SafeNetworkImage extends StatelessWidget {
         Icon(
           YaruIcons.image,
           size: 60,
-          color: Theme.of(context).colorScheme.onSurface.withOpacity(0.5),
+          color: Theme.of(context).colorScheme.onSurface.withValues(alpha: 0.5),
         );
     if (url == null) return fallBack;
     return CachedNetworkImage(