OXDEV-7726 Update changelog

CHANGELOG-v9.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [9.0.0] - unreleased
+
+### Changed
+- Extract `sendUnauthenticatedErrorResponse` from `Component\Widget\GraphQL::sendErrorResponse`
+- Change `Exception\ErrorCategories` class with interface
+- Upgrade Codeception and PHPUnit versions
+- Logo
+
+### Added
+- Missing type signatures in
+  - `Infrastructure\Legacy` class
+  - `Service\Authorization::isAllowed` method
+  - `Service\Token::getTokenClaim` method
+
+### Fixed
+- Issues reported by PHP MD
+
+[9.0.0]: https://github.com/OXID-eSales/graphql-base-module/compare/v8.0.1...b-7.1.x