fix/wrong-arch-detection

[JBOClara]

On macos with arm architecture (M1 Apple Silicon), uname may return

uname -a
Darwin FR-XXX.local 21.6.0 Darwin Kernel Version 21.6.0: Mon Aug 22 20:20:05 PDT 2022; root:xnu-8020.140.49~2/RELEASE_ARM64_T8101 x86_64 i386 MacBookPro17,1 Darwin

Currently this asdf-aws-vault plugin will download amd64 version of aws-vault.

asdf plugin-add aws-vault https://github.com/karancode/asdf-aws-vault.git && asdf install aws-vault 6.6.0
Downloading aws-vault from https://github.com/99designs/aws-vault/releases/download/v6.6.0/aws-vault-darwin-amd64.dmg

asdf plugin remove aws-vault

With this fix:

asdf plugin-add aws-vault https://github.com/JBOClara/asdf-aws-vault.git && asdf install aws-vault 6.6.0
Downloading aws-vault from https://github.com/99designs/aws-vault/releases/download/v6.6.0/aws-vault-darwin-arm64.dmg