feat: bump Node.js minimum to 20.12.0 and pinned to 24.3.0 (#2230)

## PR Checklist

- [x] Addresses an existing open issue: fixes #2184
- [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

Updates the versions to:

* Minimum: 20.19.0, the oldest LTS 20.x version with require(esm)
* Pinned: 24.3.0, the recent release with no-warning type stripping

Now that #2229 is merged, this should now be doable without risk to
downstream packages.

🎁

Author: JoshuaKGoldberg

.github/actions/prepare/action.yml

@@ -8,7 +8,7 @@ runs:
     - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
       with:
         cache: pnpm
-        node-version: 22.14.0
+        node-version: 24.3.0
     - run: pnpm install --frozen-lockfile
       shell: bash
   using: composite

.nvmrc

@@ -1 +1 @@
-22.14.0
+24.3.0

package.json

@@ -121,7 +121,7 @@
 	},
 	"packageManager": "pnpm@10.8.0",
 	"engines": {
-		"node": ">=18.3.0"
+		"node": ">=20.19.0"
 	},
 	"publishConfig": {
 		"provenance": true

src/blocks/blockNvmrc.test.ts

@@ -22,7 +22,7 @@ describe("blockNvmrc", () => {
 		const creation = testBlock(blockNvmrc, {
 			options: {
 				...optionsBase,
-				node: { minimum: ">=18.3.0", pinned: "20.18.0" },
+				node: { minimum: ">=20.19.0", pinned: "24.3.0" },
 			},
 		});
 
@@ -33,7 +33,7 @@ describe("blockNvmrc", () => {
 				}),
 			],
 			files: {
-				".nvmrc": `20.18.0\n`,
+				".nvmrc": `24.3.0\n`,
 			},
 		});
 	});

src/constants.ts

@@ -1,6 +1,6 @@
 export const defaults = {
 	node: {
-		minimum: "18.3.0",
-		pinned: "20.18.0",
+		minimum: "20.19.0",
+		pinned: "24.3.0",
 	},
 };