[main] Bump Microsoft.OpenApi.Readers from 1.6.24 to 1.6.28 (#8669)

---
updated-dependencies:
- dependency-name: Microsoft.OpenApi.Readers
  dependency-version: 1.6.28
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

eng/dependabot/independent/Versions.props

@@ -7,7 +7,7 @@
     <AzureStorageBlobsVersion>12.26.0</AzureStorageBlobsVersion>
     <AzureStorageQueuesVersion>12.24.0</AzureStorageQueuesVersion>
     <MicrosoftIdentityWebVersion>3.14.1</MicrosoftIdentityWebVersion>
-    <MicrosoftOpenApiReadersVersion>1.6.24</MicrosoftOpenApiReadersVersion>
+    <MicrosoftOpenApiReadersVersion>1.6.28</MicrosoftOpenApiReadersVersion>
     <SystemPrivateUriVersion>4.3.2</SystemPrivateUriVersion>
     <SystemSecurityPrincipalWindowsVersion>5.0.0</SystemSecurityPrincipalWindowsVersion>