cargo: Bump MSRV to 1.68

syn v2.0.107 requires rustc 1.68 or newer:
dtolnay/syn@9dbb5b7

FYI, Rust 1.85 is packaged in Debian 13 Trixie (current stable release).

Signed-off-by: Mickaël Salaün <mic@digikod.net>

Author: l0kod

Cargo.toml

@@ -2,7 +2,7 @@
 name = "landlock"
 version = "0.4.3"
 edition = "2021"
-rust-version = "1.63"
+rust-version = "1.68"
 description = "Landlock LSM helpers"
 homepage = "https://landlock.io"
 repository = "https://github.com/landlock-lsm/rust-landlock"

src/lib.rs

@@ -12,7 +12,7 @@
 //!
 //! This crate provides a safe abstraction for the Landlock system calls, along with some helpers.
 //!
-//! Minimum Supported Rust Version (MSRV): 1.63
+//! Minimum Supported Rust Version (MSRV): 1.68
 //!
 //! # Use cases
 //!