Expand NPM workflow triggers

We want to publish the new NPM package tagged with `develop` every time
changes affecting contracts get merged to `main`. We already trigger
the workflow when changes are applied in
- "contracts/**"
- "package.json"
- "yarn.lock"
but it also makes sense to trigger the workflow when there are changes
in
- "deploy/**"
- "hardhat.config.ts"
as they also can affect the content of the exported package with the
contracts.

Author: michalinacienciala

.github/workflows/npm.yml

@@ -6,6 +6,8 @@ on:
       - main
     paths:
       - "contracts/**"
+      - "deploy/**"
+      - "hardhat.config.ts"
       - "package.json"
       - "yarn.lock"
   workflow_dispatch: