Fixup missing colours and use resolved colours in UIKit.

Fix the confetti colour when using DesignKit.
Pin swift packages.
Fix UI tests target.

RiotSwiftUI/Modules/Spaces/MatrixItemChooser/View/MatrixItemChooserSectionHeader.swift

@@ -52,7 +52,7 @@ struct MatrixItemChooserSectionHeader: View {
                 .frame(maxWidth: .infinity, alignment: .leading)
                 .padding(.vertical, 8)
                 .padding(.horizontal)
-                .background(theme.colors.navigation)
+                .background(theme.colors.system)
                 .cornerRadius(8)
             }
         }