Format upload-ami code

[bryanhonof]

Ran into the following.

$ nix run github:NixOS/amis#upload-ami -- --s3-bucket some-ecs-ami --image-info "$(nix build .#.nixosConfigurations.default.config.system.build.amazonImage)"
       > wrapping `/nix/store/fm6v06r1vklw9a4c8sh0fxr73jwzz3qp-upload-ami-0.1.0/bin/nuke'...
       > Executing pythonRemoveTestsDir
       > Finished executing pythonRemoveTestsDir
       > Running phase: installCheckPhase
       > Success: no issues found in 8 source files(B
       > would reformat /private/tmp/nix-build-upload-ami-0.1.0.drv-0/upload-ami/src/upload_ami/upload_ami.py
       >
       > Oh no! 💥 💔 💥
       > 1 file would be reformatted, 7 files would be left unchanged.
       For full logs, run 'nix log /nix/store/962jvz0xnng7p0r708bsywxihz89a63v-upload-ami-0.1.0.drv'.

[arianvp]

Super weird that CI never complained about this