chore: add changeset

Author: 842u

.changeset/mighty-banks-mate.md

@@ -0,0 +1,7 @@
+---
+'@tanstack/query-devtools': patch
+---
+
+`setupStyleSheet` now sets `window.__nonce__` when a `styleNonce` is provided.
+
+The devtools use [goober](https://goober.js.org/) for CSS-in-JS, which reads `window.__nonce__` every time it creates or accesses its style element. Without this, goober overwrote the nonce with `undefined`, causing CSP violations even when `styleNonce` was correctly passed to `<ReactQueryDevtools>`.