Update node, pnpm, and npm dependencies (dart-lang#5882)

After this lands, you might need to update your Node version to the
latest v20 LTS, run `corepack install`, and `pnpm upgrade`.

The newer Node version comes with a new API that I'd like that to use in
the 11ty configuration.

Author: parlough

README.md

@@ -69,7 +69,7 @@ If you prefer, you can use a version manager such as [nvm][],
 and run `nvm install` from the repository's root directory.
 
 If you already have Node installed, verify it's available on your path
-and already the latest stable version _(currently `20.10` or later)_:
+and already the latest stable version _(currently `20.12` or later)_:
 
 ```terminal
 node --version

dash_site

@@ -1,8 +1,8 @@
 #!/bin/bash
 
-REQUIRED_DART_VERSION="3.3"
-REQUIRED_NODE_VERSION="20.10"
-REQUIRED_PNPM_VERSION="8.14"
+REQUIRED_DART_VERSION="3.4"
+REQUIRED_NODE_VERSION="20.12"
+REQUIRED_PNPM_VERSION="9.1"
 
 # Check that the 'dart' command is available on the user's path.
 if ! command -v dart &> /dev/null; then

package.json

@@ -14,16 +14,16 @@
     "build-site-for-production": "PRODUCTION=true OPTIMIZE=true eleventy"
   },
   "engines": {
-    "node": ">=20.10.0",
-    "pnpm": ">=8.14.0"
+    "node": ">=20.12.0",
+    "pnpm": ">=9.1.0"
   },
-  "packageManager": "pnpm@8.15.8",
+  "packageManager": "pnpm@9.1.4",
   "dependencies": {
     "bootstrap-scss": "^4.6.2"
   },
   "devDependencies": {
     "@11ty/eleventy": "3.0.0-alpha.10",
-    "@11ty/eleventy-img": "^4.0.2",
+    "@11ty/eleventy-img": "5.0.0-beta.4",
     "firebase-tools": "^13.10.2",
     "hast-util-from-html": "^2.0.1",
     "hast-util-select": "^6.0.2",