Fix RUSTSEC-2025-0047: Update slab dependency from 0.4.10 to 0.4.11

[Copilot]

This PR addresses a critical security vulnerability in the slab crate dependency identified as RUSTSEC-2025-0047.

Security Issue

The vulnerable slab v0.4.10 contained an out-of-bounds access vulnerability in the get_disjoint_mut method due to incorrect bounds checking. This could lead to:

• Access to uninitialized memory
• Undefined behavior
• Potential crashes

Fix

Updated the slab dependency from version 0.4.10 to 0.4.11 in Cargo.lock, which includes the security fix for the bounds checking issue.

Changes

• Cargo.lock: Updated slab version from 0.4.10 to 0.4.11
• Checksum: Updated corresponding integrity checksum

This is a minimal, backward-compatible dependency update that requires no application code changes. The fix directly addresses the security advisory recommendations.

Verification

• Validated Cargo.lock syntax and structure
• Confirmed dependency tree shows slab v0.4.11
• No breaking changes introduced

Fixes #91.

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