Bump abstract-bits to support signed integers

[puddly]

Implemented in yara-blue/abstract-bits#10, which adds support for signed integers and lets us remove a few hacks.

[Copilot]

Pull request overview

Updates the workspace to a newer abstract-bits revision that supports signed integer fields, allowing the Zigbee/protocol wire types to use i8 directly and removing local serialization workarounds.

Changes:

• Switch abstract-bits dependency to a pinned git revision and update lockfiles accordingly.
• Replace several “two’s complement in u8” fields with real i8 fields in protocol payloads and remove the corresponding casts in bridge/server/NCP code.
• Remove the custom RenamedU24 workaround and use u24 directly for Zigbee beacon tx_offset.

Reviewed changes

Copilot reviewed 11 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
crates/ziggurat-zigbee/src/beacon.rs	Drops the RenamedU24 workaround and uses u24 directly in the beacon payload (and test).
crates/ziggurat-zigbee/Cargo.toml	Points abstract-bits at the new pinned git revision.
crates/ziggurat-server/src/main.rs	Removes as u8 casts and sends i8 RSSI values directly in events.
crates/ziggurat-protocol/src/wire.rs	Changes wire payload fields from u8 to i8 for signed values (RSSI/priority/tx_power).
crates/ziggurat-protocol/src/bridge.rs	Removes now-unnecessary casts when mapping between wire payloads and driver/stack types.
crates/ziggurat-protocol/Cargo.toml	Points abstract-bits at the new pinned git revision.
crates/ziggurat-ncp-api/src/protocol.rs	Removes as u8 casts and forwards i8 RSSI values directly in events.
crates/ziggurat-ncp-api/Cargo.toml	Points abstract-bits at the new pinned git revision.
crates/ziggurat-ncp-api/Cargo.lock	Lockfile updates due to the new abstract-bits revision and its proc-macro dependency changes.
crates/ziggurat-ieee-802154/Cargo.toml	Points abstract-bits at the new pinned git revision.
crates/ziggurat-driver/src/zigbee_stack/mac.rs	Updates beacon construction to use u24 directly for tx_offset.
crates/ziggurat-driver/Cargo.toml	Points abstract-bits at the new pinned git revision.
Cargo.lock	Workspace lockfile updates due to the new abstract-bits revision and its proc-macro dependency changes.

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