cross/gcc-aarch64: bump pkgrel
Fixes the following error:
ERROR: unable to select packages:
libstdc++-13.2.1_git20231014-r1:
breaks: g++-aarch64-13.2.1_git20231014-r0[libstdc++=13.2.1_git20231014-r0]
satisfies: gcc-aarch64-13.2.1_git20231014-r0[so:libstdc++.so.6]
ccache-4.9.1-r0[so:libstdc++.so.6]
lzip-1.24-r0[so:libstdc++.so.6]