fix: allow : to be used in password

[WikiRik]

Pull Request check-list

Please make sure to review and check all of these items:

• Does npm run test pass with this change (including linting)?
• Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
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Description of change

Uses code from the main repo; https://github.com/sequelize/sequelize/blob/b3f03aed681abe0d5e22a9628b083f59f6772305/packages/core/src/utils/url.ts#L37-L43

Fixes #1388

[github-actions]

🎉 This PR is included in version 6.6.2 🎉

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