chore: [email protected] (JoshuaKGoldberg#393)

## PR Checklist

- [x] Addresses an existing open issue: fixes JoshuaKGoldberg#392; fixes JoshuaKGoldberg#324
- [x] That issue was marked as [`status: accepting
prs`](https://github.com/JoshuaKGoldberg/template-typescript-node-package/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](https://github.com/JoshuaKGoldberg/template-typescript-node-package/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

I had to go through a bunch of things to uninstall pnpm@7. I have no
clue how I installed it in the first place.

```
rm -rf $(pnpm store path)
npm un -g pnpm
brew uninstall pnpm
corepack disable pnpm
code ~/.zshrc # remove pnpm entries
sudo rm -rf /Users/josh/Library/pnpm
sudo rm -rf /usr/local/bin/pnpm
```

Author: JoshuaKGoldberg

.github/DEVELOPMENT.md

@@ -40,7 +40,7 @@ Each should be shown in VS Code, and can be run manually on the command-line:
 - `pnpm lint:knip` ([knip](https://github.com/webpro/knip)): Detects unused files, dependencies, and code exports
 - `pnpm lint:md` ([Markdownlint](https://github.com/DavidAnson/markdownlint)): Checks Markdown source files
 - `pnpm lint:package` ([npm-package-json-lint](https://npmpackagejsonlint.org/)): Lints the `package.json` file
-- `pnpm lint:packages` ([pnpm-deduplicate](https://github.com/ocavue/pnpm-deduplicate)): Deduplicates packages in the `pnpm-lock.yml` file
+- `pnpm lint:packages` ([pnpm dedupe --check](https://pnpm.io/cli/dedupe)): Checks for unnecessarily duplicated packages in the `pnpm-lock.yml` file
 - `pnpm lint:spelling` ([cspell](https://cspell.org)): Spell checks across all source files
 - `pnpm lint` ([ESLint](https://eslint.org) with [typescript-eslint](https://typescript-eslint.io)): Lints JavaScript and TypeScript source files
 

knip.jsonc

@@ -1,6 +1,6 @@
 {
 	"$schema": "https://unpkg.com/knip@next/schema.json",
 	"entry": ["src/index.ts!", "script/setup*.js"],
-	"ignoreBinaries": ["gh", "grep"],
+	"ignoreBinaries": ["dedupe", "gh", "grep"],
 	"project": ["src/**/*.ts!", "script/**/*.js"]
 }

package.json

@@ -24,7 +24,7 @@
 		"lint:knip": "knip",
 		"lint:md": "markdownlint \"**/*.md\" \".github/**/*.md\" --rules sentences-per-line",
 		"lint:package": "npmPkgJsonLint .",
-		"lint:packages": "pnpm-deduplicate --list",
+		"lint:packages": "pnpm dedupe --check",
 		"lint:spelling": "cspell \"**\" \".github/**/*\"",
 		"prepare": "husky install",
 		"setup": "node script/setup.js",
@@ -70,7 +70,6 @@
 		"npm-package-json-lint-config-default": "^5.0.0",
 		"npm-user": "^5.0.1",
 		"octokit": "^2.0.11",
-		"pnpm-deduplicate": "^0.4.1",
 		"prettier": "^2.8.3",
 		"prettier-plugin-packagejson": "^2.4.2",
 		"release-it": "^15.6.0",
@@ -82,7 +81,7 @@
 		"vitest": "^0.29.0",
 		"yaml-eslint-parser": "^1.2.0"
 	},
-	"packageManager": "pnpm@7.32.2",
+	"packageManager": "pnpm@8.3.1",
 	"engines": {
 		"node": ">=18"
 	}