Merge bitcoin/bitcoin#22790: test: add aarch64-apple-darwin platform entry to get_previous_releases

f6e4db27ceb67157dc13d13f34351cb87fec2be5 test: add aarch64-apple-darwin platform entry to get_previous_releases (Zero-1729)

Pull request description:

  Over the course of reviewing a PR, I had to edit `test/get_previous_releases.py` (after I ran `git clean -xdff`) to run the backwards compatibility tests (e.g. `wallet_upgradewallet`, `feature_backwards_compatibility`, etc.), as currently on master, running the script as indicated in [`test/README.md`](https://github.com/bitcoin/bitcoin/blob/master/test/README.md), for example, on an M1 machine results in the following error, as the `aarch64-apple-darwin*` platform entry is presently not recognised:

  > Output from an M1 machine running macOS v11.5.2

  ```sh
  $ test/get_previous_releases.py -b v0.20.1 v0.19.1 v0.18.1 v0.17.2 v0.16.3 v0.15.2
  Releases directory: releases
  Not sure which binary to download for aarch64-apple-darwin20.6.0
  ```

  As a quick fix, this PR adds the missing `aarch64-apple-darwin*` platform entry. Running the script now results in fetching the old binaries, as expected:

  ```sh
  $ test/get_previous_releases.py -b v0.20.1 v0.19.1 v0.18.1 v0.17.2 v0.16.3 v0.15.2

  Releases directory: releases
  Fetching: https://bitcoincore.org/bin/bitcoin-core-0.20.1/bitcoin-0.20.1-osx64.tar.gz
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
    0 20.9M    0     0    0     0      0      0 --:--:--  0:00:02 --:--:--     0
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
  100 20.9M  100 20.9M    0     0   136k      0  0:02:37  0:02:37 --:--:-- 95607
  Checksum matched

  …

  Checksum matched
  ```

  After this patch, the backwards compatibility tests also run successfully, as expected.

  **Note**: I am open to other possible solutions.

  ---

  Steps to reproduce:

  > Ensure you take out the binaries in `releases` if they already exist.

  Try running `test/get_previous_releases.py -b v0.15.2` or similar to fetch the old release binaries.

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Tree-SHA512: a238d909b70a61be622234bc49b05d2e91a8acfc5ea348d29f2c8a927fb793cb97365e558571e3f46d6a5650c4f3c6e28fa126c6e56b38e1eb98f7c3e3594d0f

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