Build(deps-dev): bump @types/node from 12.6.8 to 12.6.9

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 12.6.8 to 12.6.9.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

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

package.json

@@ -33,7 +33,7 @@
 	"devDependencies": {
 		"@types/copy-webpack-plugin": "^5.0.0",
 		"@types/firefox-webext-browser": "^67.0.2",
-		"@types/node": "^12.6.8",
+		"@types/node": "^12.6.9",
 		"@types/semver": "^6.0.1",
 		"@types/webpack": "^4.32.1",
 		"@wext/shipit": "^0.2.0",