Auto merge of #27817 - servo:dependabot/cargo/gfx-backend-dx11-0.6.15, r=jdm

Bump gfx-backend-dx11 from 0.6.0 to 0.6.15

Bumps [gfx-backend-dx11](https://github.com/gfx-rs/gfx) from 0.6.0 to 0.6.15.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/gfx-rs/gfx/blob/master/CHANGELOG.md">gfx-backend-dx11's changelog</a>.</em></p>
<blockquote>
<h1>Change Log</h1>
<h3>backend-dx12-unreleased</h3>
<ul>
<li>fix SPIR-V entry point selection</li>
</ul>
<h3>backend-vulkan-0.6.5 (15-10-2020)</h3>
<ul>
<li>support different types of descriptors in a single <code>DescriptorSetWrite</code></li>
</ul>
<h3>backend-dx12-0.6.3 backend-dx11-0.6.1 backend-metal-0.6.2 auxil-0.5.1 (31-08-2020)</h3>
<ul>
<li>update spirv_cross to 0.21:
<ul>
<li>force zero initialization in all generated shaders</li>
<li>force the use of native arrays for MSL</li>
</ul>
</li>
</ul>
<h3>backend-dx12-0.6.7 (12-10-2020)</h3>
<ul>
<li>get proper support for compressed textures</li>
</ul>
<h3>backend-dx12-0.6.6 (05-10-2020)</h3>
<ul>
<li>allow color blend factors to be used on alpha channel</li>
</ul>
<h3>backend-dx12-0.6.5 (04-10-2020)</h3>
<ul>
<li>implement command buffer markers</li>
<li>debug names for render passes and descriptor sets</li>
</ul>
<h3>backend-vulkan-0.6.3 (30-09-2020)</h3>
<ul>
<li>enable VK_KHR_maintenance3 when VK_EXT_descriptor_indexing is enabled</li>
</ul>
<h3>backend-dx12-0.6.4 backend-vulkan-0.6.2 backend-metal-0.6.3 (23-09-2020)</h3>
<ul>
<li>fix descriptor indexing features</li>
</ul>
<h3>backend-dx11-0.6.4 (07-09-2020)</h3>
<ul>
<li>fix memory flush ranges</li>
<li>support presentation modes</li>
</ul>
<h3>backend-dx11-0.6.3 (04-09-2020)</h3>
<ul>
<li>fix cpu-visible mapping</li>
<li>fix UAV reset count</li>
</ul>
<h3>backend-dx11-0.6.2 (02-09-2020)</h3>
<ul>
<li>fix bindings filter by shader stages</li>
<li>implement copies from buffers into R8, RG8, and RGBA8 textures</li>
<li>fix read-only storage buffer support</li>
<li>fix race condition in internal shader operations</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/gfx-rs/gfx/commits">compare view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=gfx-backend-dx11&package-manager=cargo&previous-version=0.6.0&new-version=0.6.15)](https://dependabot.com/compatibility-score/?dependency-name=gfx-backend-dx11&package-manager=cargo&previous-version=0.6.0&new-version=0.6.15)

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[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

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