Run apt-get update for AArch64 builds

Author: lnicola

.github/workflows/release.yaml

@@ -174,6 +174,9 @@ jobs:
         profile: minimal
         override: true
 
+    - name: Update apt repositories
+      run: sudo apt-get update
+
     - name: Install target toolchain
       run: sudo apt-get install gcc-aarch64-linux-gnu