ci: update publish workflow to use .nvmrc

Update GitHub Actions publish workflow to use node version from .nvmrc
file instead of hardcoded version 18.

Ticket: VL-3418

Author: andrew-scott-fischer

.github/workflows/publish.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
-          node-version: 18
+          node-version-file: .nvmrc
 
       - name: Install BitGoJS
         run: yarn install --with-frozen-lockfile