Akita Client v0.21.13

Improved the packet-count information that gets printed during packet capture.
Added statically linked Linux binaries for amd64 and arm64.

• amd64: https://releases.akita.software/cli/0.21.13/akita_0.21.13_linux_amd64_static.zip
• arm64: https://releases.akita.software/cli/0.21.13/akita_0.21.13_linux_arm64_static.zip