Update uefi requirement from 0.15 to 0.20 in /kernel

[dependabot]

Updates the requirements on uefi to permit the latest version.

Changelog

Sourced from uefi's changelog.

uefi - 0.20.0 (2023-03-19)

As of this release, the UEFI crates work on the stable channel. This requires Rust 1.68 or higher.

Added

• Added the ComponentName1 and ComponentName2 protocols. The ComponentName wrapper will automatically select ComponentName2 if available, and fall back to ComponentName1 otherwise.
• FileType, FileHandle, RegularFile, and Directory now implement Debug.
• Added RuntimeServices::delete_variable() helper method.
• Implement Borrow for CString16 and ToOwned for CStr16.

Changed

• SystemTable::exit_boot_services now takes no parameters and handles the memory map allocation itself. Errors are now treated as unrecoverable and will cause the system to reset.
• Re-export the cstr8, cstr16, and entry macros from the root of the uefi crate.
• HandleBuffer and ProtocolsPerHandle now implement Deref. The HandleBuffer::handles and ProtocolsPerHandle::protocols methods have been deprecated.
• Removed 'boot lifetime from the GraphicsOutput, Output, Pointer, and Serial protocols.
• The generic type Data of uefi::Error<Data: Debug> doesn't need to be Display to be compatible with core::error::Error. Note that the error Trait requires the unstable feature.
• deprecation removals:
  • interfaces BootServices::locate_protocol and BootServices::handle_protocol were removed. BootServices::open_protocol and BootServices::open_protocol_exclusive are better variants and available since EFI 1.10 (2002).
  • ScopedProtocol::interface is not public anymore. Use the Deref trait.

uefi-macros - 0.11.0 (2023-03-19)

Changed

• Errors produced by the entry macro have been improved.

uefi-services - 0.17.0 (2023-03-19)

Changed

• Drop use of unstable alloc_error_handler feature. As of Rust 1.68 we can use default_alloc_error_handler instead.

... (truncated)

Commits

• 3060567 chore: Release
• 1e2cac5 uefi: Bump uefi-macros version
• 5be8fc8 chore: Release
• 2e1c75a Update docs for the switch from nightly to stable
• 2a3439f Change toolchain from nightly to stable
• b5cfce5 Drop explicit enabling of abi_efiapi feature
• b1f9c2d uefi-services: Drop use of unstable alloc_error_handler feature
• 6b730d5 Merge pull request #662 from JarlEvanson/issue#661
• bbc030a mem/doc: minor documentation adjustments
• 646fe86 mem: add MemoryMap type with sort method
• Additional commits viewable in compare view

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[dependabot]

Superseded by #301.