Fix download link for GCC to always use the latest version

Author: antoyo

.github/workflows/ci.yaml

@@ -150,7 +150,7 @@ jobs:
       - if: matrix.toolchain == 'rustc_codegen_gcc'
         run: |
           apt-get -y --no-install-recommends purge cpp gcc
-          curl --proto '=https' --tlsv1.2 -sSfLO https://github.com/antoyo/gcc/releases/download/master/gcc-13.deb
+          curl --proto '=https' --tlsv1.2 -sSfLO https://github.com/antoyo/gcc/releases/latest/download/gcc-13.deb
           dpkg -i gcc-13.deb
 
           git clone --depth 1 --branch $(linux/scripts/min-tool-version.sh rustc) https://github.com/rust-lang/rust.git rust-repo