[release] package.json: update version to v0.21.1

Change-Id: I86c061fc174f3e660b8b021afa423d369a193e1d
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/285260
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
diff --git a/package-lock.json b/package-lock.json
index 86e08ec..3c4c072 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "go",
-  "version": "0.21.0",
+  "version": "0.21.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index a6428c5..dd3ff04 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "go",
   "displayName": "Go",
-  "version": "0.21.0",
+  "version": "0.21.1",
   "publisher": "golang",
   "description": "Rich Go language support for Visual Studio Code",
   "author": {