Add 1.21.1 to Mod and Modpack downloadpage version filter

Plain Craft Launcher 2/Pages/PageDownload/PageDownloadMod.xaml

@@ -33,6 +33,7 @@
                         <TextBlock VerticalAlignment="Center" Grid.Row="2" HorizontalAlignment="Left" Text="版本" Margin="0,0,18,0" />
                         <local:MyComboBox x:Name="TextSearchVersion" Grid.Row="2" Grid.Column="1" Grid.ColumnSpan="2" IsEditable="True" MaxDropDownHeight="320">
                             <local:MyComboBoxItem Content="全部 (也可自行输入)" IsSelected="True" />
+                            <local:MyComboBoxItem Content="1.21.1" />
                             <local:MyComboBoxItem Content="1.21" />
                             <local:MyComboBoxItem Content="1.20.6" />
                             <local:MyComboBoxItem Content="1.20.4" />

Plain Craft Launcher 2/Pages/PageDownload/PageDownloadPack.xaml

@@ -32,6 +32,7 @@
                         <TextBlock VerticalAlignment="Center" Grid.Row="2" HorizontalAlignment="Left" Text="版本" Margin="0,0,18,0" />
                         <local:MyComboBox x:Name="TextSearchVersion" Grid.Row="2" Grid.Column="1" IsEditable="True" MaxDropDownHeight="320">
                             <local:MyComboBoxItem Content="全部 (也可自行输入)" IsSelected="True" />
+                            <local:MyComboBoxItem Content="1.21.1" />
                             <local:MyComboBoxItem Content="1.21" />
                             <local:MyComboBoxItem Content="1.20.6" />
                             <local:MyComboBoxItem Content="1.20.4" />