update main.yml

Bump node version from 16 to 18

Author: mxschll

.github/workflows/main.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
-          node-version: "16"
+          node-version: "18"
       - uses: pnpm/[email protected]
         with:
           version: 6.0.2