fix: bump markdownlint to 0.38 (#2238)

## PR Checklist

- [x] Addresses an existing open issue: ~fixes #000~ General dependency
bump.
- [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

Bumps:

```plaintext
 markdownlint     0.37.4  →  0.38.0
 markdownlint-cli 0.44.0  →  0.45.0
```

🎁

Author: JoshuaKGoldberg

package.json

@@ -106,8 +106,8 @@
 		"knip": "5.46.0",
 		"lint-staged": "15.5.0",
 		"lodash": "4.17.21",
-		"markdownlint": "0.37.4",
-		"markdownlint-cli": "0.44.0",
+		"markdownlint": "0.38.0",
+		"markdownlint-cli": "0.45.0",
 		"prettier": "3.6.1",
 		"prettier-plugin-curly": "0.3.2",
 		"prettier-plugin-packagejson": "2.5.15",