fix: set projectService to false in ESLint parserOptions (#178)

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### Summary of changes

- The latest release made this change required, otherwise we would get a
"Parsing error: Enabling "project" does nothing when "projectService" is
enabled. You can remove the "project" setting" error
-
https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.46.4
(typescript-eslint/typescript-eslint#11333)


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Thanks for creating this pull request 🤗

Author: puehringer

config/eslint.config.template.js

@@ -86,6 +86,8 @@ module.exports = ({
           // https://github.com/typescript-eslint/typescript-eslint/issues/251
           tsconfigRootDir,
           project: `./tsconfig.eslint.json`,
+          // Disable the project service as it must not be set together with project: https://github.com/typescript-eslint/typescript-eslint/issues/11319
+          projectService: false,
         },
         globals: {
           ...globals.commonjs,