chore(deps): update pnpm to v10.20.0

Author: renovate[bot]

package.json

@@ -4,7 +4,7 @@
  "type": "module",
  "version": "3.0.1",
  "license": "MIT",
- "packageManager": "pnpm@10.19.0",
+ "packageManager": "pnpm@10.20.0",
  "scripts": {
  "lc:new": "tsx ./src/cmd/leetcode.ts",
  "dev": "astro dev",