client/web: update vite-plugin-svgr to latest version (#11197)

Update vite-plugin-svgr to the latest version (4.2.0) ahead of updating
vite to 5.x. This is a major version bump from our previous 3.x, and
requires changing the import paths used for SVGs.

Updates https://github.com/tailscale/corp/issues/17715

Signed-off-by: Mario Minardi <mario@tailscale.com>

client/web/src/ui/toaster.tsx

@@ -10,7 +10,7 @@ import React, {
   useState,
 } from "react"
 import { createPortal } from "react-dom"
-import { ReactComponent as X } from "src/assets/icons/x.svg"
+import X from "src/assets/icons/x.svg?react"
 import { noop } from "src/utils/util"
 import { create } from "zustand"
 import { shallow } from "zustand/shallow"