Update to Node 22 (active LTS)

Include a refinement of how to use Node in the development instructions, avoid writing the Node/Python version multiple times.

- See https://nodejs.org/en/blog/release/v22.11.0
- See wagtail/wagtail#12531

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
           cache: 'npm'
       - uses: actions/setup-python@v5
         with:
@@ -36,7 +36,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
           cache: 'npm'
       - uses: actions/setup-python@v5
         with:

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: '22'
           cache: npm
 
       - name: Install Node dependencies

.nvmrc

@@ -1 +1 @@
-20
+22

.readthedocs.yaml

@@ -7,7 +7,7 @@ build:
   os: ubuntu-22.04
   tools:
     python: '3.12'
-    nodejs: '20'
+    nodejs: '22'
   jobs:
     post_install:
       - make install-frontend

docs/development.rst

@@ -7,8 +7,9 @@ Development
 ===========
 
 
-For local development you need a system with Node v20.x, Python3, and Git.
-It is strongly recommended to use a Python virtual environment (`venv`_).
+For local development you need a system with Node v22.x, Python3, and Git.
+It is strongly recommended to use a Python virtual environment (`venv`_) and
+you use `fnm <https://github.com/Schniz/fnm>`_ to manage your Node versions.
 The build process derives the version from repository data, so it's necessary
 to clone the repository and not just download a single snapshot.
 
@@ -81,7 +82,7 @@ rather than using the shortcuts in the Makefile. Assume the commands below are
 all run in PowerShell. These instructions will also work on Mac or Linux without
 make installed as well.
 
-First, be sure to install Python 3, and Node 20.
+First, be sure to install Python, and Node.
 `fnm <https://github.com/Schniz/fnm>`_ is really useful for
 managing multiple versions of Node on Windows.
 

package.json

@@ -39,7 +39,7 @@
     "lint": "npm run lint:js && npm run lint:css"
   },
   "engines": {
-    "node": ">=20"
+    "node": ">=22"
   },
   "prettier": {
     "singleQuote": true,