Bump the all-dependencies group with 1 update (#235)

Bumps Azure.Identity from 1.20.0 to 1.21.0

---
updated-dependencies:
- dependency-name: Azure.Identity
  dependency-version: 1.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all-dependencies
...

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Author: dependabot[bot]

Directory.Packages.props

@@ -18,7 +18,7 @@
     <PackageVersion Include="AspNetCore.HealthChecks.UI.Client" Version="9.0.0" />
     <PackageVersion Include="AspNetCore.HealthChecks.UI.InMemory.Storage" Version="9.0.0" />
     <PackageVersion Include="Azure.Data.Tables" Version="12.11.0" />
-    <PackageVersion Include="Azure.Identity" Version="1.20.0" />
+    <PackageVersion Include="Azure.Identity" Version="1.21.0" />
     <PackageVersion Include="Azure.Monitor.OpenTelemetry.AspNetCore" Version="1.4.0" />
     <PackageVersion Include="Azure.Security.KeyVault.Secrets" Version="4.9.0" />
     <PackageVersion Include="Azure.Storage.Blobs" Version="12.27.0" />