[release] package.json: fix version string

During merge, I forgot to drop -dev suffix.

Change-Id: I50399ae9fa34d090936216ee3abbff130eaa4efd
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/402354
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Nooras Saba‎ <saba@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
diff --git a/package.json b/package.json
index 59ffa98..5a7a519 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "go",
   "displayName": "Go",
-  "version": "0.33.0-dev",
+  "version": "0.33.0",
   "publisher": "golang",
   "description": "Rich Go language support for Visual Studio Code",
   "author": {