advertise support for MSC4133 and MSC4175

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/client/capabilities.rs

@@ -7,6 +7,7 @@ use ruma::{
 	},
 	RoomVersionId,
 };
+use serde_json::json;
 
 use crate::{Result, Ruma};
 
@@ -42,6 +43,11 @@ pub(crate) async fn get_capabilities_route(
 		enabled: false,
 	};
 
+	// MSC4133 capability
+	capabilities
+		.set("uk.tcpip.msc4133.profile_fields", json!({"enabled": true}))
+		.expect("this is valid JSON we created");
+
 	Ok(get_capabilities::v3::Response {
 		capabilities,
 	})