chore: prepare release 2.1.0

Author: github-actions[bot]

.changeset/add_spent_element_endpoints.md

@@ -1,3 +1,25 @@
+## 2.1.0 (2025-03-25)
+
+### Features
+
+#### Added Spent Element Endpoints
+
+Added two new endpoints `[GET] /outputs/siacoin/:id/spent` and `[GET] /outputs/siafund/:id/spent`. These endpoints will return a boolean, indicating whether the UTXO was spent, and the transaction it was spent in. These endpoints are designed to make verifying Atomic swaps easier.
+
+##### Example Usage
+
+````
+$ curl http://localhost:9980/api/outputs/siacoin/9b89152bb967130326702c9bfb51109e9f80274ec314ba58d9ef49b881340f2f/spent
+{
+    spent: true,
+    event: {}
+}
+```
+
+#### Fixes sending V2 transactions in the UI
+
+- Fixes V2 signing for wallets that do not have siafund outputs. Fixes #247
+
 ## 2.0.0 (2025-02-21)
 
 ### Breaking Changes

.changeset/fix_v2_signing.md

@@ -1,4 +1,4 @@
-module go.sia.tech/walletd/v2 // v2.0.0
+module go.sia.tech/walletd/v2 // v2.1.0
 
 go 1.23.1