App Config - 1.9.0 Release

[mrm9084]

Description

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

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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.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

This PR prepares the azure-appconfiguration Python package for the 1.9.0 release by updating the changelog and bumping the package version constants.

Changes:

• Updated CHANGELOG.md to publish the 1.9.0 entry with a release date.
• Bumped the package version from 1.8.2 to 1.9.0 in both the public and generated _version.py files.

Reviewed changes

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

File	Description
sdk/appconfiguration/azure-appconfiguration/CHANGELOG.md	Publishes the 1.9.0 release notes (but should retain a new top “Unreleased” section post-release).
sdk/appconfiguration/azure-appconfiguration/azure/appconfiguration/_version.py	Updates the package version constant to 1.9.0.
sdk/appconfiguration/azure-appconfiguration/azure/appconfiguration/_generated/_version.py	Updates the generated version constant to 1.9.0 for consistency.