fix(deps): update rust crate landlock to v0.4.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
landlock (source)	dependencies	patch	0.4.1 -> 0.4.2

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Release Notes

landlock-lsm/rust-landlock (landlock)

v0.4.2

Compare Source

New API

• Added support for Landlock ABI 6: control abstract UNIX sockets and signal scoping with the new Ruleset::scope() method taking a Scope enum (PR #​96 and PR #​98).
• Added From<RulesetCreated> implementation for Option<OwnedFd> (PR #​104)
• Introduced a new HandledAccess trait specific to AccessFs and AccessNet (commit 554217dda0b7).
• Added a new Errno type to improve FFI support (PR #​86 and PR #​102).
• Exposed From<i32> implementation for ABI (PR #​88).

Documentation

• Added clarifying notes about AccessFs::WriteFile behavior and path_beneath_rules usage (PR #​80).
• Introduced CONTRIBUTING.md with testing workflow explanations (PR #​76).

Testing

• Enhanced test coverage for new API and added testing against Linux 6.12 (PR #​96).
• Updated CI configuration to use the latest Ubuntu versions (PR #​87 and PR #​97).
• Modified default LANDLOCK_CRATE_TEST_ABI to match the current kernel for more convenient local testing (PR #​76).

Example

• Synchronized the sandboxer example with the C version (PR #​101): improved error handling for inaccessible file paths and enhanced help documentation.

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