chore: add arm64 builds

[mikhailswift]

Noticed replicated cluster shell was causing my shell to open in x84_64 using Rosetta on my Macbook.

Inspecting the CLI binary showed it's a universal binary but only contained an x86_64 build.

$ file /opt/homebrew/bin/replicated
/opt/homebrew/bin/replicated: Mach-O universal binary with 1 architecture: [x86_64:Mach-O 64-bit executable x86_64]
/opt/homebrew/bin/replicated (for architecture x86_64):	Mach-O 64-bit executable x86_64

After adding arm64 as an arch to the goreleaser config and running goreleaser release --skip=publish locally shows the built universal binary now contains an arm64 build as well.

$ file ./replicated
./replicated: Mach-O universal binary with 2 architectures: [x86_64:Mach-O 64-bit executable x86_64] [arm64]
./replicated (for architecture x86_64):	Mach-O 64-bit executable x86_64
./replicated (for architecture arm64):	Mach-O 64-bit executable arm64

Also reported in #489