[Storage] Remove latest service version from blob as it's not released yet (Azure#23778)

Author: jalauzon-msft

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

@@ -3,7 +3,6 @@
 ## 12.12.0b1 (Unreleased)
 
 ### Features Added
-- Added support for service version 2021-06-08.
 - Added support for `create_container_if_not_exists()` for `BlobContainerClient`
 
 ## 12.11.0 (2022-03-29)

sdk/storage/azure-storage-blob/azure/storage/blob/_serialize.py

@@ -49,8 +49,7 @@
     '2020-10-02',
     '2020-12-06',
     '2021-02-12',
-    '2021-04-10',
-    '2021-06-08'
+    '2021-04-10'
 ]