package.json: start the v0.41.0-dev cycle

Fixes #3035

Change-Id: If8b1a8dee1a3447d24cb3d4c288d93fafaba28d9
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/544057
Reviewed-by: Suzy Mueller <[email protected]>
Auto-Submit: Hyang-Ah Hana Kim <[email protected]>
Run-TryBot: Hyang-Ah Hana Kim <[email protected]>
Commit-Queue: Hyang-Ah Hana Kim <[email protected]>
TryBot-Result: kokoro <[email protected]>

Author: hyangah

package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "go",
   "displayName": "Go",
-  "version": "0.40.0-dev",
+  "version": "0.41.0-dev",
   "preview": true,
   "publisher": "golang",
   "description": "Rich Go language support for Visual Studio Code",