chore: run install as part of vscode:prepublish

I believe the reason the patch release failed last time was that vsce
validates that package.json matches node_modules (good thing to have!)
so you ship what you think you ship. When the version of the language
server package is bumped by semantic-release it only updates the package.json,
since it's designed for publishing packages, not publishing built and bundled
assets necessarily. At least that's my theory. We'll see next time I guess.
No harm in manually bumping the version should it be something else.

vscode-extension/package.json

@@ -118,7 +118,7 @@
 		"shx": "0.3.4"
 	},
 	"scripts": {
-		"vscode:prepublish": "npm run build",
+		"vscode:prepublish": "npm install && npm run build",
 		"clean": "shx rm -rf dist",
 		"build": "npm run clean && webpack --mode production",
 		"dev": "npm run clean && webpack --mode development",