fix: use npx in transition action (#2019)

## PR Checklist

- [x] Addresses an existing open issue: fixes #2018
- [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

🎁

Author: JoshuaKGoldberg

src/blocks/blockCTATransitions.test.ts

@@ -37,7 +37,7 @@ describe("blockCTATransitions", () => {
 			runs:
 			  steps:
 			    - uses: ./.github/actions/prepare
-			    - run: pnpx create-typescript-app
+			    - run: npx create-typescript-app
 			      shell: bash
 			    - id: auto-commit-action
 			      uses: stefanzweifel/git-auto-commit-action@v5
@@ -51,7 +51,7 @@ describe("blockCTATransitions", () => {
 			      with:
 			        issue: \${{ github.event.pull_request.number }}
 			        message: >-
-			          🤖 Beep boop! I ran \`pnpx create-typescript-app\` and it updated some
+			          🤖 Beep boop! I ran \`npx create-typescript-app\` and it updated some
 			          files.
 
 			          I went ahead and checked those changes into this PR for you. Please

src/blocks/blockCTATransitions.ts

@@ -35,7 +35,7 @@ export const blockCTATransitions = base.createBlock({
 									steps: [
 										{ uses: "./.github/actions/prepare" },
 										{
-											run: "pnpx create-typescript-app",
+											run: "npx create-typescript-app",
 											shell: "bash",
 										},
 										{
@@ -56,7 +56,7 @@ export const blockCTATransitions = base.createBlock({
 											with: {
 												issue: "${{ github.event.pull_request.number }}",
 												message: [
-													"🤖 Beep boop! I ran `pnpx create-typescript-app` and it updated some files.",
+													"🤖 Beep boop! I ran `npx create-typescript-app` and it updated some files.",
 													"I went ahead and checked those changes into this PR for you. Please review the latest commit to see if you want to merge it.",
 													"Cheers!",
 													" — _The Friendly Bingo Bot_ 💝",