add Node.js 18, 20 and 22 to engines

npm 10.8.2 doesn't install the `latest` tagged version of @pkgjs/support
with Node.js 22 as Node.js 22 is outside of the declared specification
for `engines`->`node`.

Regardless of whether the change in behaviour of npm is correct for a
semver-patch release of npm, update the `engines` field to include the
supported Node.js release lines at this point in time.

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x, 16.x, 17.x]
+        node-version: [10.x, 12.x, 14.x, 16.x, 17.x, 18.x, 20.x, 22.x]
         os: [ubuntu-latest, windows-latest]
 
     steps:

package.json

@@ -48,6 +48,6 @@
     "mocha": "^6.2.0"
   },
   "engines": {
-    "node": "^17 || ^16 || ^14 || ^13 || ^12 || ^11 || ^10.19"
+    "node": "^22 || ^20 || ^18 || ^17 || ^16 || ^14 || ^13 || ^12 || ^11 || ^10.19"
   }
 }