Add date to changelog and change dependency for azure-postgresql-auth

[mattboentoro]

Description

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

If an SDK is being regenerated based on a new API spec, a link to the pull request containing these API spec changes should be included above.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

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• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

This PR updates the azure-postgresql-auth package metadata to reflect a new azure-core minimum dependency and modifies the 1.0.2 changelog entry to include a release date.

Changes:

• Bump azure-core minimum requirement to >=1.31.0 in pyproject.toml.
• Update CHANGELOG.md for version 1.0.2 by replacing the “(Unreleased)” marker with a specific date and trimming headings.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
sdk/postgresql/azure-postgresql-auth/pyproject.toml	Raises the minimum required azure-core version for the package.
sdk/postgresql/azure-postgresql-auth/CHANGELOG.md	Marks 1.0.2 as dated and adjusts the section structure for that release entry.