(ci) update apt repo before aarch64 build tools are installed (#1096)

Author: matthewdouglas

.github/workflows/python-package.yml

@@ -56,7 +56,8 @@ jobs:
         build_os=${{ matrix.os }}
         build_arch=${{ matrix.arch }}
         if [ ${build_os:0:6} == ubuntu -a ${build_arch} == aarch64 ]; then
-          # Allow cross-compile om aarch64
+          # Allow cross-compile on aarch64
+          sudo apt-get update
           sudo apt-get install -y gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu g++-aarch64-linux-gnu
           cmake -DCMAKE_C_COMPILER=aarch64-linux-gnu-gcc -DCMAKE_CXX_COMPILER=aarch64-linux-gnu-g++ -DCOMPUTE_BACKEND=cpu .
         elif [ ${build_os:0:5} == macos -a ${build_arch} == aarch64 ]; then