Update eslint-config-prettier version in "Check JavaScript" template installation docs

This is now the version used as standard in all Arduino Tooling projects, which the "template" is intended to be used
with

Author: per1234

workflow-templates/check-javascript-task.md

@@ -31,7 +31,7 @@ The tool dependencies of this workflow are managed by [npm](https://www.npmjs.co
 Add the dependencies by running this command:
 
 ```text
-npm install --save-dev eslint@^8.35.0 eslint-config-prettier@^8.6.0
+npm install --save-dev eslint@^8.35.0 eslint-config-prettier@^8.7.0
 npx install-peerdeps --dev eslint-config-airbnb-base
 ```