chore: remove @types/prettier (#1440)

## PR Checklist

- [x] Addresses an existing open issue: fixes #1438
- [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

Removes the devDependency and its uninstallation.

Author: JoshuaKGoldberg

package.json

@@ -64,7 +64,6 @@
 		"@types/js-yaml": "^4.0.9",
 		"@types/node": "^20.10.4",
 		"@types/parse-author": "^2.0.3",
-		"@types/prettier": "^3.0.0",
 		"@typescript-eslint/eslint-plugin": "^7.2.0",
 		"@typescript-eslint/parser": "^7.2.0",
 		"@vitest/coverage-v8": "^1.0.2",

pnpm-lock.yaml

@@ -34,7 +34,6 @@ export async function uninstallPackages(offline: boolean | undefined) {
 			"@types/git-url-parse",
 			"@types/js-yaml",
 			"@types/parse-author",
-			"@types/prettier",
 			"all-contributors-cli",
 			"c8",
 			"eslint-config-prettier",