TBR: version bump

Change-Id: I53b6e7356315ff9b145357024272e20fd55f7e47
diff --git a/extension/manifest.json b/extension/manifest.json
index 581301e..d181dd3 100644
--- a/extension/manifest.json
+++ b/extension/manifest.json
@@ -1,6 +1,6 @@
 {
   "name": "Vanadium Extension",
-  "version": "0.1.20",
+  "version": "0.1.21",
   "description": "Access and create Vanadium services from JavaScript.",
   "manifest_version": 2,
   "icons": {