Bump the SDK to 25.05.21 and adopt the new way of dealing with timelines and delegates.

The room list items no longer hold any timeline instances and they can now be created through the normal `room.timelineWithConfiguration` mechanism.
This also means that we can move the UTD hook away from the sync service and into the client itself but setting it is now fallible as it can only be set once.

ElementX.xcodeproj/project.pbxproj

@@ -8708,7 +8708,7 @@
 			repositoryURL = "https://github.com/element-hq/matrix-rust-components-swift";
 			requirement = {
 				kind = exactVersion;
-				version = 25.05.19;
+				version = 25.05.21;
 			};
 		};
 		701C7BEF8F70F7A83E852DCC /* XCRemoteSwiftPackageReference "GZIP" */ = {

ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -158,8 +158,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/element-hq/matrix-rust-components-swift",
       "state" : {
-        "revision" : "a290a27931a75db67b93f27329b09f5110553415",
-        "version" : "25.5.19"
+        "revision" : "ce4a5f25ada21246d62e4b54c26fb1414432fb77",
+        "version" : "25.5.21"
       }
     },
     {