Bump v18.0.0-nightly.20211221

ELECTRON_VERSION

@@ -1 +1 @@
-18.0.0-nightly.20211220
+18.0.0-nightly.20211221

package.json

@@ -1,6 +1,6 @@
 {
   "name": "electron",
-  "version": "18.0.0-nightly.20211220",
+  "version": "18.0.0-nightly.20211221",
   "repository": "https://github.com/electron/electron",
   "description": "Build cross platform desktop apps with JavaScript, HTML, and CSS",
   "devDependencies": {

shell/browser/resources/win/electron.rc

@@ -50,8 +50,8 @@ END
 //
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION 18,0,0,20211220
- PRODUCTVERSION 18,0,0,20211220
+ FILEVERSION 18,0,0,20211221
+ PRODUCTVERSION 18,0,0,20211221
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L