build: update node to version 20.17 and pnpm to version 9

Author: chrisalley

.github/workflows/ci.yml

@@ -7,13 +7,13 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        node-version: [20]
+        node-version: [20.17]
     steps:
       - uses: actions/checkout@v4
       - name: Install pnpm
         uses: pnpm/action-setup@v4
         with:
-          version: 8
+          version: 9.10.0
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
         with:

.npmrc

@@ -0,0 +1,2 @@
+engine-strict=true
+use-node-version=20.17.0 # Required due to an issue with pnpm: https://github.com/pnpm/pnpm/issues/4203#issuecomment-1876106073

package.json

@@ -40,5 +40,8 @@
     "stylelint-config-standard": "^36.0.1",
     "typescript": "^5.5.3",
     "typescript-eslint": "^8.0.1"
+  },
+  "engines": {
+    "node": ">=20.17"
   }
 }