Fix hf-xet release workflow (#586)

hf-xet release workflow has been failing (see the last two commits into
`main`) due to outdated package list. This updates the package list
before installing a package.

Author: seanses

.github/workflows/release.yml

@@ -80,6 +80,7 @@ jobs:
           shopt -s expand_aliases
           if [[ ${{ matrix.platform.target }} == "aarch64" ]]
           then
+            sudo apt-get update
             sudo apt-get install -y binutils-aarch64-linux-gnu
             alias objcopy=aarch64-linux-gnu-objcopy
           fi
@@ -165,6 +166,7 @@ jobs:
           shopt -s expand_aliases
           if [[ ${{ matrix.platform.target }} == "aarch64" ]]
           then
+            sudo apt-get update
             sudo apt-get install -y binutils-aarch64-linux-gnu
             alias objcopy=aarch64-linux-gnu-objcopy
           fi