feat: add pnpm-deduplicate to devDependenciesToRemove arr (#824)

## PR Checklist

- [x] Addresses an existing open issue: fixes #769 
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/create-typescript-app/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/create-typescript-app/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

This PR is responsible for adding the `pnpm-deduplicate` package to
`devDependenciesToRemove` array

Author: jdwilkin4

src/steps/writing/creation/writePackageJson.ts

@@ -22,6 +22,7 @@ const devDependenciesToRemove = [
 	"jest",
 	"mocha",
 	"npm-run-all",
+	"pnpm-deduplicate",
 	"pretty-quick",
 	"ts-jest",
 ];