Remove version field from package.json

The `version` field is only needed if the package is to be published. In this project, package.json is only used for
manage dependencies and scripts for internal development.

For this reason, having a `version` field is harmful because it increases the effort and complexity of making a release,
and also is likely to get out of sync with the true version.

Author: per1234

package-lock.json

@@ -1,6 +1,5 @@
 {
   "name": "arduino-lint-action",
-  "version": "1.0.0",
   "private": true,
   "description": "Check Arduino projects for problems",
   "main": "lib/main.js",