Bump xamarin/backport-bot-action from 1.0 to 1.1 (#16367)

Bumps
[xamarin/backport-bot-action](https://github.com/xamarin/backport-bot-action)
from 1.0 to 1.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="c27c1d5a07"><code>c27c1d5</code></a>
Scope env to step</li>
<li><a
href="da97d664ca"><code>da97d66</code></a>
Inputs -&gt; secrets</li>
<li><a
href="7d536aa14f"><code>7d536aa</code></a>
Update inputs -&gt; secrets</li>
<li><a
href="69c12fcadc"><code>69c12fc</code></a>
Create reusable workflow to replace composite action</li>
<li>See full diff in <a
href="https://github.com/xamarin/backport-bot-action/compare/v1.0...v1.1">compare
view</a></li>
</ul>
</details>
<br />


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.github/workflows/backport-trigger.yml

@@ -10,7 +10,7 @@ jobs:
     if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/sudo backport')
 
     steps:
-      - uses: xamarin/backport-bot-action@v1.0
+      - uses: xamarin/backport-bot-action@v1.1
         with:
           pull_request_url: ${{ github.event.issue.pull_request.url }}
           comment_body: ${{ github.event.comment.body }}