chore: remove Renovate internalChecksFilter override (with default …

…value) (#332)

## PR Checklist

- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/boston-ts-website/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

This is actually the default value:
https://docs.renovatebot.com/configuration-options/#internalchecksfilter

.github/renovate.json

@@ -1,7 +1,6 @@
 {
 	"$schema": "https://docs.renovatebot.com/renovate-schema.json",
 	"automerge": true,
-	"internalChecksFilter": "strict",
 	"labels": ["dependencies"],
 	"minimumReleaseAge": "3 days",
 	"postUpdateOptions": ["pnpmDedupe"]