chore: adds required npm audit check to PRs

[krpeacock]

Description

Also upgrades github actions to v4

Checklist:

• My changes follow the guidelines in CONTRIBUTING.md.
• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.

[github-actions]

size-limit report 📦

Path	Size
@dfinity/agent	84.83 KB (0%)
@dfinity/candid	13.58 KB (0%)
@dfinity/principal	4.97 KB (0%)
@dfinity/auth-client	59.87 KB (0%)
@dfinity/assets	79.54 KB (0%)
@dfinity/identity	57.16 KB (0%)
@dfinity/identity-secp256k1	265.13 KB (-5.73% 🔽)