fix: run pnpm dedupe without --offline (#2006)

## PR Checklist

- [x] Addresses an existing open issue: fixes #2005
- [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

Added a snapshot test while I was in the area.

💖

Author: JoshuaKGoldberg

src/blocks/blockPnpmDedupe.test.ts

@@ -0,0 +1,65 @@
+import { testBlock } from "bingo-stratum-testers";
+import { describe, expect, test } from "vitest";
+
+import { blockPnpmDedupe } from "./blockPnpmDedupe.js";
+import { optionsBase } from "./options.fakes.js";
+
+describe("blockPnpmDedupe", () => {
+	test("production", () => {
+		const creation = testBlock(blockPnpmDedupe, {
+			options: optionsBase,
+		});
+
+		expect(creation).toMatchInlineSnapshot(`
+			{
+			  "addons": [
+			    {
+			      "addons": {
+			        "sections": {
+			          "Linting": {
+			            "contents": {
+			              "items": [
+			                "- \`pnpm lint:packages\` ([pnpm dedupe --check](https://pnpm.io/cli/dedupe)): Checks for unnecessarily duplicated packages in the \`pnpm-lock.yml\` file",
+			              ],
+			            },
+			          },
+			        },
+			      },
+			      "block": [Function],
+			    },
+			    {
+			      "addons": {
+			        "jobs": [
+			          {
+			            "name": "Lint Packages",
+			            "steps": [
+			              {
+			                "run": "pnpm lint:packages",
+			              },
+			            ],
+			          },
+			        ],
+			        "removedWorkflows": [
+			          "lint-packages",
+			        ],
+			      },
+			      "block": [Function],
+			    },
+			    {
+			      "addons": {
+			        "cleanupCommands": [
+			          "pnpm dedupe",
+			        ],
+			        "properties": {
+			          "scripts": {
+			            "lint:packages": "pnpm dedupe --check",
+			          },
+			        },
+			      },
+			      "block": [Function],
+			    },
+			  ],
+			}
+		`);
+	});
+});

src/blocks/blockPnpmDedupe.ts

@@ -31,7 +31,7 @@ export const blockPnpmDedupe = base.createBlock({
 					removedWorkflows: ["lint-packages"],
 				}),
 				blockPackageJson({
-					cleanupCommands: ["pnpm dedupe --offline"],
+					cleanupCommands: ["pnpm dedupe"],
 					properties: {
 						scripts: {
 							"lint:packages": "pnpm dedupe --check",