chore(deps): update pnpm to v10.20.0

Author: renovate[bot]

package.json

@@ -57,7 +57,7 @@
     "url": "https://github.com/web-infra-dev/rspack"
   },
   "engines": {
-    "pnpm": "10.18.3"
+    "pnpm": "10.20.0"
   },
   "devDependencies": {
     "@biomejs/biome": "^2.3.3",
@@ -86,7 +86,7 @@
     "webpack": "5.102.1",
     "zx": "8.8.5"
   },
-  "packageManager": "pnpm@10.18.3",
+  "packageManager": "pnpm@10.20.0",
   "pnpm": {
     "patchedDependencies": {
       "webpack-sources@3.3.3": "patches/webpack-sources@3.3.3.patch"