test(shared): cover explicit HTTPS port

[k11kirky]

Problem

Add a harmless test-only change to exercise the pull request workflow.

Why: This dummy PR verifies the end-to-end signed commit and draft PR flow without changing production behavior.

Changes

• Cover an explicit HTTPS port in isSafeExternalUrl tests.

How did you test this?

• pnpm --filter @posthog/shared exec vitest run src/url.test.ts
• pnpm exec biome check packages/shared/src/url.test.ts

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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Created with PostHog Code

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 322e343.}