refactor(indexeddb): add deprecation note on open_stores_with_name()

Signed-off-by: Michael Goldenberg <m@mgoldenberg.net>

crates/matrix-sdk-indexeddb/src/lib.rs

@@ -172,6 +172,7 @@ impl IndexeddbStores {
 
 /// Create a [`IndexeddbStateStore`] and a [`IndexeddbCryptoStore`] that use the
 /// same name and passphrase.
+#[deprecated(note = "this function only opens state and crypto stores, use `IndexeddbStores::open()` instead.")]
 #[cfg(all(feature = "e2e-encryption", feature = "state-store"))]
 pub async fn open_stores_with_name(
     name: &str,