chore: locking prettier version for CI

[krpeacock]

Description

There's a bug with pretty-quick that's causing problems in CI: prettier/eslint-plugin-prettier#562

Downgrading for now until that's fixed.

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	98.58 KB (0%)
@dfinity/candid	13.41 KB (0%)
@dfinity/principal	5.01 KB (0%)
@dfinity/auth-client	90.58 KB (0%)
@dfinity/assets	91.11 KB (0%)
@dfinity/identity	88.06 KB (0%)
@dfinity/identity-secp256k1	254.38 KB (0%)