Increment version for appconfiguration releases (#35794)

* Increment package version after release of azure-appconfiguration-provider

* Update _version.py

* Update CHANGELOG.md

---------

Co-authored-by: Matthew Metcalf <[email protected]>

Author: azure-sdk

sdk/appconfiguration/azure-appconfiguration-provider/CHANGELOG.md

@@ -1,5 +1,15 @@
 # Release History
 
+## 1.2.0b1 (Unreleased)
+
+### Features Added
+
+### Breaking Changes
+
+### Bugs Fixed
+
+### Other Changes
+
 ## 1.2.0 (2024-05-24)
 
 ### Features Added

sdk/appconfiguration/azure-appconfiguration-provider/azure/appconfiguration/provider/_version.py

@@ -4,4 +4,4 @@
 # license information.
 # -------------------------------------------------------------------------
 
-VERSION = "1.2.0"
+VERSION = "1.2.0b1"