Bump optimum[openvino] from 1.21.3 to 1.21.4 (openvinotoolkit#784)

Bumps [optimum[openvino]](https://github.com/huggingface/optimum) from
1.21.3 to 1.21.4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/huggingface/optimum/releases">optimum[openvino]'s
releases</a>.</em></p>
<blockquote>
<h2>v1.21.4: Patch release</h2>
<ul>
<li>Update Habana extra in setup.py by <a
href="https://github.com/regisss"><code>@​regisss</code></a> in <a
href="https://redirect.github.com/huggingface/optimum/issues/1991">#1991</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/huggingface/optimum/compare/v1.21.3...v1.21.4">https://github.com/huggingface/optimum/compare/v1.21.3...v1.21.4</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/huggingface/optimum/commit/98bcd45cfcacf79e2efdb62903da151449f54713"><code>98bcd45</code></a>
Release: v1.21.4</li>
<li><a
href="https://github.com/huggingface/optimum/commit/8fd19ef59f1499bc1005a7c418b9a3b14ab920ec"><code>8fd19ef</code></a>
Update Habana extra in setup.py (<a
href="https://redirect.github.com/huggingface/optimum/issues/1991">#1991</a>)</li>
<li>See full diff in <a
href="https://github.com/huggingface/optimum/compare/v1.21.3...v1.21.4">compare
view</a></li>
</ul>
</details>
<br />


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samples/requirements.txt

@@ -1,4 +1,4 @@
 --extra-index-url https://download.pytorch.org/whl/cpu
-optimum[openvino]==1.21.3
+optimum[openvino]==1.21.4
 einops==0.8.0  # For Qwen
 transformers_stream_generator==0.0.5  # For Qwen