[release/9.0] Bump Microsoft.OpenApi.Readers from 1.6.24 to 1.6.28

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

eng/dependabot/independent/Versions.props

@@ -7,7 +7,7 @@
     <AzureStorageBlobsVersion>12.25.1</AzureStorageBlobsVersion>
     <AzureStorageQueuesVersion>12.23.0</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>