ci: switch back to npm install for npm version compatibility

npm ci requires exact lockfile match which fails when lockfile is generated
with npm 11.x but CI uses npm 10.x. Using npm install provides better
compatibility across npm versions while still respecting the lockfile.

Author: chhoumann

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
         with:
             deno-version: v1.x
       - name: Install dependencies
-        run: npm ci
+        run: npm install
       - name: Lint
         run: npm run lint
       - name: Format check