Update Changelog after core and identity release (Azure#24550)

Author: samvaity

sdk/formrecognizer/azure-ai-formrecognizer/CHANGELOG.md

@@ -31,6 +31,9 @@ To continue to use Form Recognizer API version 2.1, please use major version 3 o
 ### Bugs Fixed
 
 ### Other Changes
+#### Dependency Updates
+- Upgraded `azure-core` dependency to 1.21.0
+- Upgraded `azure-identity` dependency to 1.3.7
 
 ## 3.1.4 (2021-09-09)
 ### Other Changes

sdk/formrecognizer/azure-ai-formrecognizer/README.md

@@ -161,7 +161,7 @@ Authentication with AAD requires some initial setup:
 <dependency>
     <groupId>com.azure</groupId>
     <artifactId>azure-identity</artifactId>
-    <version>1.3.6</version>
+    <version>1.3.7</version>
 </dependency>
 ```
 [//]: # ({x-version-update-end})