chore(ci): Fix release target for arm64

Author: epage

.github/workflows/post-release.yml

@@ -68,7 +68,7 @@ jobs:
         - build: linux
           os: ubuntu-20.04
           rust: stable
-          target: arm64-unknown-linux-musl
+          target: aarch64-unknown-linux-musl
         - build: macos
           os: macos-latest
           rust: stable