[Key Vault] Update changelogs for release (Azure#20607)

Author: mccoyp

sdk/keyvault/azure-keyvault-administration/CHANGELOG.md

@@ -1,16 +1,9 @@
 # Release History
 
-## 4.1.0b1 (Unreleased)
+## 4.1.0b1 (2021-09-09)
 
 ### Features Added
-- Key Vault API version 7.3-preview is the default version
-
-### Breaking Changes
-
-### Key Bugs Fixed
-
-### Fixed
-
+- Key Vault API version 7.3-preview is now the default
 
 ## 4.0.0 (2021-06-22)
 ### Changed

sdk/keyvault/azure-keyvault-certificates/CHANGELOG.md

@@ -1,16 +1,13 @@
 # Release History
 
-## 4.4.0b1 (Unreleased)
+## 4.4.0b1 (2021-09-09)
 
 ### Features Added
 - Key Vault API version 7.3-preview is now the default
 
-### Breaking Changes
-
-### Key Bugs Fixed
-
-### Fixed
-
+### Other Changes
+- Updated type hints to fix mypy errors
+  ([#19158](https://github.com/Azure/azure-sdk-for-python/issues/19158))
 
 ## 4.3.0 (2021-06-22)
 This is the last version to support Python 3.5. The next version will require Python 2.7 or 3.6+.

sdk/keyvault/azure-keyvault-keys/CHANGELOG.md

@@ -1,14 +1,10 @@
 # Release History
 
-## 4.5.0b3 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
-
-### Bugs Fixed
+## 4.5.0b3 (2021-09-09)
 
 ### Other Changes
+- Updated type hints to fix mypy errors
+  ([#19158](https://github.com/Azure/azure-sdk-for-python/issues/19158))
 
 ## 4.5.0b2 (2021-08-10)
 

sdk/keyvault/azure-keyvault-secrets/CHANGELOG.md

@@ -1,16 +1,13 @@
 # Release History
 
-## 4.4.0b1 (Unreleased)
+## 4.4.0b1 (2021-09-09)
 
 ### Features Added
 - Key Vault API version 7.3-preview is now the default
 
-### Breaking Changes
-
-### Key Bugs Fixed
-
-### Fixed
-
+### Other Changes
+- Updated type hints to fix mypy errors
+  ([#19158](https://github.com/Azure/azure-sdk-for-python/issues/19158))
 
 ## 4.3.0 (2021-06-22)
 This is the last version to support Python 3.5. The next version will require Python 2.7 or 3.6+.