Bump Microsoft.OpenApi.Readers from 1.5.0 to 1.6.0 in /eng/dependabot (#3530)

Bumps [Microsoft.OpenApi.Readers](https://github.com/Microsoft/OpenAPI.NET) from 1.5.0 to 1.6.0.
- [Release notes](https://github.com/Microsoft/OpenAPI.NET/releases)
- [Commits](microsoft/OpenAPI.NET@1.5.0...1.6.0)

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

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

Author: dependabot[bot]

eng/dependabot/Versions.props

@@ -11,7 +11,7 @@
     <MicrosoftExtensionsLoggingConsoleVersion>7.0.0</MicrosoftExtensionsLoggingConsoleVersion>
     <MicrosoftExtensionsLoggingEventSourceVersion>7.0.0</MicrosoftExtensionsLoggingEventSourceVersion>
     <MicrosoftIdentityModelTokensVersion>6.26.0</MicrosoftIdentityModelTokensVersion>
-    <MicrosoftOpenApiReadersVersion>1.5.0</MicrosoftOpenApiReadersVersion>
+    <MicrosoftOpenApiReadersVersion>1.6.0</MicrosoftOpenApiReadersVersion>
     <SystemPrivateUriVersion>4.3.2</SystemPrivateUriVersion>
     <SystemSecurityPrincipalWindowsVersion>5.0.0</SystemSecurityPrincipalWindowsVersion>