Unable to install heroku-cli on aarch64 architecture

Do you want to request a *feature* or report a *bug*?
-----------------------------------------------------
Bug

What is the current behavior?
-----------------------------
In the install script for heroku-cli, the ARM check tests the output of `uname -m` against the pattern `arm*`.
This does not work for `aarch64` architecture, which is the same as `arm64`.

Output:
```sh
$ uname -m
aarch64
$ curl -s https://cli-assets.heroku.com/install.sh | sh
unsupported arch: aarch64
```

Steps to reproduce:
- Launch a docker container using `centos:latest` with `aarch64` architecture.
- Try installing heroku-cli

What is the expected behavior?
------------------------------
The install script should check for both `arm*` and `aarch*`.

Current heroku version: `heroku/7.47.13 linux-arm64 node-v15.9.0`
The arm64 version runs just fine on aarch64 (which it should, since it's arm64).

Temporary workaround
------------------------------

By replacing the `arm*` check with `aarch*`, the install script works.
This is a pretty dirty hack though and should really not be needed.
```
# replace arm* check with aarch* if you're affected by this bug
curl -s https://cli-assets.heroku.com/install.sh | sed 's/arm\*/aarch\*/g' | sh
```