3.54.0: Adds new contracts/ version, and updates changelog (#5431)

# Pull Request Template

## Description

GA: 
<img width="1434" height="711" alt="Screenshot 2025-10-03 124319"
src="https://github.com/user-attachments/assets/cbaf31ad-98bc-4a19-896f-7c4caf8b1abc"
/>


Preview: 
<img width="1491" height="581" alt="Screenshot 2025-10-03 125120"
src="https://github.com/user-attachments/assets/8d0a1cb4-d95f-4170-9c31-92845a986e1a"
/>


## Type of change

Please delete options that are not relevant.

- [] New feature (non-breaking change which adds functionality)


## Closing issues

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---------

Co-authored-by: Ananth Mudumba <amudumba@microsoft.com>

Author: NaluTripician

Directory.Build.props

@@ -1,8 +1,8 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 	<PropertyGroup>
-		<ClientOfficialVersion>3.53.1</ClientOfficialVersion>
-		<ClientPreviewVersion>3.54.0</ClientPreviewVersion>
-		<ClientPreviewSuffixVersion>preview.1</ClientPreviewSuffixVersion>
+		<ClientOfficialVersion>3.54.0</ClientOfficialVersion>
+		<ClientPreviewVersion>3.55.0</ClientPreviewVersion>
+		<ClientPreviewSuffixVersion>preview.0</ClientPreviewSuffixVersion>
 		<DirectVersion>3.41.0</DirectVersion>
 		<FaultInjectionVersion>1.0.0</FaultInjectionVersion>
 		<FaultInjectionSuffixVersion>beta.0</FaultInjectionSuffixVersion>