chore: bump @e4a/pg-js to 1.7.1

[dobby-coder]

Bumps @e4a/pg-js from 1.6.2 to 1.7.1.

Verification

• npm install — 0 vulnerabilities
• npm run docs:build — build complete in ~7s, no errors

Reviewer quickstart

git fetch origin && git checkout chore/bump-pg-js-1.7.1 && npm install && npm run docs:dev

Closes #91

[dobby-coder]

Verified locally:

• npm install — 0 vulnerabilities
• npm run docs:build — clean build in ~8s
• Diff is the minimal ^1.6.2 → ^1.7.1 bump in package.json + lockfile, matching the linked issue
• CI build job passing

Cannot formally approve (same bot account opened the PR), but no concerns — ready for @rubenhensen to merge.