fix(ci): drop Node 20 from matrix (xo 3.x requires Node 22+)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: AchoArnold

.github/workflows/main.yml

@@ -12,7 +12,6 @@ jobs:
                 node-version:
                     - latest
                     - 22
-                    - 20
 
         steps:
             - uses: actions/checkout@v4

package.json

@@ -17,7 +17,7 @@
 	},
 	"types": "./dist/index.d.ts",
 	"engines": {
-		"node": ">=20"
+		"node": ">=22"
 	},
 	"scripts": {
 		"test": "xo --env=node && npm run build && mocha -r ts-node/register 'tests/**/*.js'",