[release/8.0] Bump the azure-storage-dependencies group (#7002)

Bumps the azure-storage-dependencies group in /eng/dependabot/independent with 2 updates: [Azure.Storage.Blobs](https://github.com/Azure/azure-sdk-for-net) and [Azure.Storage.Queues](https://github.com/Azure/azure-sdk-for-net).


Updates `Azure.Storage.Blobs` from 12.20.0 to 12.21.0
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Storage.Blobs_12.20.0...Azure.Storage.Blobs_12.21.0)

Updates `Azure.Storage.Queues` from 12.18.0 to 12.19.0
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Storage.Queues_12.18.0...Azure.Storage.Queues_12.19.0)

---
updated-dependencies:
- dependency-name: Azure.Storage.Blobs
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: azure-storage-dependencies
- dependency-name: Azure.Storage.Queues
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: azure-storage-dependencies
...

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

eng/dependabot/independent/Versions.props

@@ -3,8 +3,8 @@
 
   <PropertyGroup>
     <AzureIdentityVersion>1.12.0</AzureIdentityVersion>
-    <AzureStorageBlobsVersion>12.20.0</AzureStorageBlobsVersion>
-    <AzureStorageQueuesVersion>12.18.0</AzureStorageQueuesVersion>
+    <AzureStorageBlobsVersion>12.21.0</AzureStorageBlobsVersion>
+    <AzureStorageQueuesVersion>12.19.0</AzureStorageQueuesVersion>
     <MicrosoftIdentityWebVersion>2.20.0</MicrosoftIdentityWebVersion>
     <MicrosoftOpenApiReadersVersion>1.6.15</MicrosoftOpenApiReadersVersion>
     <SystemPrivateUriVersion>4.3.2</SystemPrivateUriVersion>