[Event Hubs] October Processor Release Prep (Azure#31683)

The focus of these changes is to prepare the Event Hubs Processor package
for the October release.

Author: jsquire

sdk/eventhub/Azure.Messaging.EventHubs.Processor/CHANGELOG.md

@@ -1,12 +1,6 @@
 # Release History
 
-## 5.8.0-beta.1 (Unreleased)
-
-### Features Added
-
-### Breaking Changes
-
-### Bugs Fixed
+## 5.7.3 (2022-10-11)
 
 ### Other Changes
 

sdk/eventhub/Azure.Messaging.EventHubs.Processor/src/Azure.Messaging.EventHubs.Processor.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <Description>Azure Event Hubs is a highly scalable publish-subscribe service that can ingest millions of events per second and stream them to multiple consumers.  This library extends its Event Processor with durable storage for checkpoint information using Azure Blob storage.  For more information about Event Hubs, see https://azure.microsoft.com/en-us/services/event-hubs/</Description>
-    <Version>5.8.0-beta.1</Version>
+    <Version>5.7.3</Version>
     <!--The ApiCompatVersion is managed automatically and should not generally be modified manually.-->
     <ApiCompatVersion>5.7.2</ApiCompatVersion>
     <PackageTags>Azure;Event Hubs;EventHubs;.NET;Event Processor;EventProcessor;$(PackageCommonTags)</PackageTags>