Remove header level from changelogs (Azure#24168)

Author: rickle-msft

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

@@ -2,7 +2,6 @@
 
 ## 12.0.0-beta.9 (2021-09-15)
 ### Other changes
-#### Dependency updates
 - Updated blob dependency to 12.14.0
 
 ## 12.0.0-beta.8 (2021-07-28)

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

@@ -2,7 +2,6 @@
 
 ## 12.0.0-beta.9 (2021-09-15)
 ### Other changes
-#### Dependency Updates
 - Updated `azure-storage-blob` to version `12.14.0`
 
 ## 12.0.0-beta.8 (2021-07-28)

sdk/storage/azure-storage-internal-avro/CHANGELOG.md

@@ -2,7 +2,6 @@
 
 ## 12.1.0 (2021-09-15)
 ### Other changes
-#### Dependency Updates
 - Updated `azure-storage-common` to version `12.13.0`
 
 ## 12.1.0-beta.1 (2021-07-28)