chore: bump ejs and spectron

Removes [ejs](https://github.com/mde/ejs). It's no longer used after updating ancestor dependency [spectron](https://github.com/electron/spectron). These dependencies need to be updated together.


Removes `ejs`

Updates `spectron` from 5.0.0 to 19.0.0
- [Release notes](https://github.com/electron/spectron/releases)
- [Changelog](https://github.com/electron-userland/spectron/blob/master/CHANGELOG.md)
- [Commits](electron-userland/spectron@v5.0.0...v19.0.0)

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: indirect
- dependency-name: spectron
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -45,7 +45,7 @@
     "request": "^2.70.0",
     "rimraf": "^2.5.2",
     "signcode": "^1.0.0",
-    "spectron": "^5.0.0",
+    "spectron": "^19.0.0",
     "standard": "^8.2.0",
     "tap": "^14.10.6"
   },