build(deps): bump gfx-backend-metal from 0.5.4 to 0.5.6

[dependabot-preview]

Bumps gfx-backend-metal from 0.5.4 to 0.5.6.

Changelog

Sourced from gfx-backend-metal's changelog.

hal-0.5.2 backend-dx12-0.5.7 backend-metal-0.5.4 backend-vulkan-0.5.8 (12-06-2020)

• add descriptor indexing features and enable on supported backends

hal-0.5.1 backend-dx12-0.5.6 backend-metal-0.5.3 backend-vulkan-0.5.7 (10-06-2020)

• add TEXTURE_DESCRIPTOR_ARRAY feature and enable on supported backends

backend-dx12-0.5.5 (01-06-2020)

• implement descriptor pool destruction

backend-dx12-0.5.4 (29-05-2020)

• fix detection of integrated gpus
• fix UB in compile_shader

backend-dx11-0.5.1, backend-dx12-0.5.3, backend-gl-0.5.1, backend-metal-0.5.2 (05-05-2020)

• update spirv_cross to 0.20

backend-dx12-0.5.2 (05-04-2020)

• fix offset calculation for root descriptors

backend-dx12-0.5.1 (01-01-2020)

• fix drop of physical devices
• handle device lost during a fence wait
• rework the way swapchain waits to acquire new frames

backend-vulkan-0.5.6 (27-04-2020)

• gracefully detect when the driver supports it but hardware does not

backend-vulkan-0.5.3 (25-04-2020)

• switch to VK_LAYER_KHRONOS_validation

backend-vulkan-0.5.2 (01-04-2020)

• fix support for AMD_NEGATIVE_VIEWPORT_HEIGHT

backend-metal-0.5.1 (26-03-2020)

• fix debug assertion for the index buffer range
• fix NDC_Y_FLIP feature

backend-vulkan-0.5.1 (26-03-2020)

• fix debug color markers
• fix detection of the MirrorClamp mode

hal-0.5.0 (23-03-2020)

• API changes:
  • allocating command buffers or descriptor sets no longer touches the heap
  • DescriptorType is now a rich enum
  • RangeArg trait is removed, instead the offsets are required, and the sizes are optional
  • Removed Anisotropic and SubpassRef enums in favor of options
• Features:
  • debug markers
  • new WrapMode::MirrorClamp

Commits

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[CYBAI]

Close due to duplicated metal

[dependabot-preview]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.