Bump frontend dependencies

Also swap Jest with Vitest, so that we can drop the Babel config.

frontend/src/vite-env.d.ts

@@ -13,7 +13,3 @@
 // limitations under the License.
 
 /// <reference types="vite/client" />
-
-declare module "babel-plugin-relay/macro" {
-  export { graphql as default } from "react-relay";
-}