chore: see if we can get away with setting the NPM_TOKEN in config rather than in .npmrc

## Summary

So, bad news, the [last change](044c967) still [didn't work](https://github.com/solana-labs/solana-web3.js/actions/runs/4603084508/jobs/8132751693) because of some vagaries of saving the pnpm cache at the end of the run. Let's see if we can get this done without modifying `.npmrc` at all.

Author: steveluscher

.github/workflows/cicd.yml

@@ -50,7 +50,7 @@ jobs:
 
       - name: Publish NPM
         run: |
-          echo $'\n//registry.npmjs.org/:_authToken=${NPM_TOKEN}' >> .npmrc
+          pnpm config set '//registry.npmjs.org/:_authToken' "${NPM_TOKEN}"
           pnpm publish-packages
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}