Force rust toolchain for web-client NPM build

And remove unnecessary steps and deviations from the default.

[skip ci]

.github/workflows/npm_publish.yml

@@ -14,19 +14,15 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
+          toolchain: 1.81.0
           targets: wasm32-unknown-unknown
       - uses: Swatinem/rust-cache@v2
-      - uses: jetli/[email protected]
-        with:
-          version: 'latest'
       - name: Build package
         working-directory: ./web-client
         run: ./scripts/build.sh
       - uses: actions/setup-node@v4
         with:
-          node-version: '18.x'
           registry-url: 'https://registry.npmjs.org'
-      - run: npm install -g npm
       - name: Publish to npm
         working-directory: ./web-client/dist
         run: npm publish --tag next --provenance