[release-v0.48]extension/package.json: update version to 0.48.0

This is an automated CL which updates the package.json and package-lock.json.

Change-Id: Ic886e4815b5f58529f822efad82d808347b4caa0
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/684136
kokoro-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Madeline Kalil <mkalil@google.com>
Reviewed-by: Hongxiang Jiang <hxjiang@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Hongxiang Jiang <hxjiang@golang.org>

extension/package-lock.json

diff --git a/extension/package-lock.json b/extension/package-lock.json
index 8486f76..2d885cc 100644
--- a/extension/package-lock.json
+++ b/extension/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "go",
-  "version": "0.48.0-dev",
+  "version": "0.48.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "go",
-      "version": "0.48.0-dev",
+      "version": "0.48.0",
       "license": "MIT",
       "dependencies": {
         "diff": "4.0.2",

extension/package.json

diff --git a/extension/package.json b/extension/package.json
index 0d82957..27f705f 100644
--- a/extension/package.json
+++ b/extension/package.json
@@ -1,7 +1,7 @@
 {
   "name": "go",
   "displayName": "Go",
-  "version": "0.48.0-dev",
+  "version": "0.48.0",
   "publisher": "golang",
   "description": "Rich Go language support for Visual Studio Code",
   "author": {