chore(node): add node 20 to ci

this commit updates the development dependencies for the project to use
node v20. by updating the versions of node/npm that volta uses, the
versioning changes are/will be automatically picked up by the ci
workflow (as they pull from the volta key in `package.json`)

.github/dependabot.yml

@@ -13,7 +13,7 @@ updates:
     rebase-strategy: "disabled"
     ignore:
       - dependency-name: "@types/node"
-        versions: ["17", "18"]
+        versions: [">=21"]
       - dependency-name: "typescript"
         versions: [">=4.10", ">=5.0"]
   - package-ecosystem: 'github-actions'

package.json

@@ -30,7 +30,7 @@
     "@rollup/plugin-node-resolve": "^15.0.0",
     "@stencil/core": "^3.0.0",
     "@types/jest": "^26.0.15",
-    "@types/node": "^16.11.48",
+    "@types/node": "^20.2.0",
     "jest": "^26.6.3",
     "np": "^7.0.0",
     "prettier": "^2.2.1",
@@ -58,7 +58,7 @@
   },
   "prettier": "@ionic/prettier-config",
   "volta": {
-    "node": "16.15.0",
-    "npm": "8.11.0"
+    "node": "20.2.0",
+    "npm": "9.6.6"
   }
 }