deps: bump rustix to 1.1.6 (#2312)This should hopefully address an unsoundness warning from cargo-audit:```Crate: rustixVersion: 1.1.4Warning: unsoundTitle: xattr functions mark unwritten bytes as initialized when given a zero-length bufferDate: 2026-10-27ID: RUSTSEC-2026-0486URL: https://rustsec.org/advisories/RUSTSEC-2026-0486```