Bump changelogs (#36508)

Author: weirongw23-msft

sdk/storage/azure-storage-blob/CHANGELOG.md

@@ -1,8 +1,9 @@
 # Release History
 
-## 12.21.0 (2024-07-16)
+## 12.21.0 (2024-07-17)
 
 ### Features Added
+- Stable release of features from 12.21.0b1
 - Added new `chars` keyword to the `StorageStreamDownloader.read` method to support reading an arbitrary number of
 characters from the stream rather than bytes. This can only be used when `encoding` is specified on `download_blob`
 but can help prevent decoding errors in certain scenarios.

sdk/storage/azure-storage-file-datalake/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 12.16.0 (2024-07-16)
+## 12.16.0 (2024-07-17)
 
 ### Features Added
 - Stable release of features from 12.16.0b1

sdk/storage/azure-storage-file-share/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 12.17.0 (2024-07-16)
+## 12.17.0 (2024-07-17)
 
 ### Features Added
 - Stable release of features from 12.17.0b1

sdk/storage/azure-storage-queue/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 12.11.0 (2024-07-16)
+## 12.11.0 (2024-07-17)
 
 ### Features Added
 - Stable release of features from 12.11.0b1