Rollup merge of #129048 - heiher:update-crosstool-loongarch64, r=Mark-Simulacrum

Update `crosstool-ng` for loongarch64

The current cross-compilation toolchain for the LoongArch64 target consists of GCC 13.2.0, Binutils 2.40, and Glibc 2.36. However, Binutils 2.40 has known issues that in broken binaries without any error reports:

- rust-lang/rust#121289
- cross-rs/cross#1538

This patch upgrades the cross-compilation toolchain for the LoongArch64 target to resolve these issues.

- GCC: 13.2.0 -> 14.2.0
- Binutils: 2.40 -> 2.42

The new binaries remain compatible with the existing GCC 13.2.0/Glibc 2.36 distribution, and no issues have been identified.

try-job: dist-loongarch64-linux

Author: tgross35