Update changes-6.9.1

Pick-to: 6.9
Change-Id: Ibc945b27b8bf80e3f07cb893bbaa107830fb40bc
Reviewed-by: Shyamnath Premnadh <Shyamnath.Premnadh@qt.io>

Author: FriedemannKleint

doc/changelogs/changes-6.9.1

@@ -17,6 +17,10 @@ information about a particular change.
 *                                  PySide6                                 *
 ****************************************************************************
 
+ -  [PYSIDE-841] An example showing an audio graph using Qt Graphs has been
+                 added.
+ - [PYSIDE-2193] A crash retrieving a Python type QObject property
+                 (encapsulated in a QVariant) been fixed.
  - [PYSIDE-3052] class QMessageLogger has been added for handling debug,
                  info, warning, critical, and fatal messages,
                  including support for QLoggingCategory.
@@ -25,6 +29,8 @@ information about a particular change.
  - [PYSIDE-3021] type-hints: The QMessagebox annotations has been fixed.
  - [PYSIDE-3029] type-hints: The hints for properties on __init__ functions
                  has been fixed.
+ - [PYSIDE-3041] type hints: The str parameter of  QLineEdit.setText() has
+                 been made optional.
  - [PYSIDE-3050] type hints: Type signature for
                  QProgressDialog.setCancelButton has been fixed.
  - [PYSIDE-3055] type hints: Type signature for QTabBar.setTabButton has
@@ -42,6 +48,8 @@ information about a particular change.
                  error set has been fixed.
  - [PYSIDE-3069] A crash retrieving a QGraphicsProxyObject from a QVariant
                  has been fixed.
+ - [PYSIDE-3078] type hints: The parent widget parameter of the
+                 QInputDialog get() methods has been made optional.
  - [PYSIDE-3087] The dependency of pyside6-project on tomlkit has been
                  removed.
  - [PYSIDE-3089] An error in pyside6-metaobjectdump when encountering