Bump Terraform azuread provider version to 2.51.0 (#718)

<Actions>
<action
id="6d17e7acdb2f3311576150379e22805f2f9b4aa72ff00ec136aceee45cae4b98">
        <h3>Bump Terraform `azuread` provider version</h3>
<details
id="1d9343c012f5434ac9fe8a98135bae3667b399259be16d9b14302ea3bd424a24">
            <summary>Update Terraform lock file</summary>
<p>changes detected:&#xA;&#x9;&#34;hashicorp/azuread&#34; updated from
&#34;2.50.0&#34; to &#34;2.51.0&#34; in file
&#34;.terraform.lock.hcl&#34;</p>
            <details>
                <summary>2.51.0</summary>
<pre>Changelog retrieved
from:&#xA;&#x9;https://github.com/hashicorp/terraform-provider-azuread/releases/tag/v2.51.0&#xA;ENHANCEMENTS:&#xA;&#xA;*
`data.azuread_users` - support for the `mails` property
([#1400](https://github.com/hashicorp/terraform-provider-azuread/issues/1400))&#xA;&#xA;BUG
FIXES:&#xA;&#xA;* `azuread_access_package_assignment_policy` - fix a bug
preventing removal of the `assignment_review_settings` block
([#1394](https://github.com/hashicorp/terraform-provider-azuread/issues/1394))&#xA;&#xA;&#xA;</pre>
            </details>
        </details>
<a
href="https://infra.ci.jenkins.io/job/updatecli/job/azure/job/main/221/">Jenkins
pipeline link</a>
    </action>
</Actions>

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