Fail to execute python after upgrading asdf by Homebrew

### Provide environment information

```bash
OS:
Darwin VLAN2-dhcp147.is.env.kitakyu-u.ac.jp 23.2.0 Darwin Kernel Version 23.2.0: Wed Nov 15 21:59:33 PST 2023; root:xnu-10002.61.3~2/RELEASE_ARM64_T8112 arm64

SHELL:
zsh 5.9 (x86_64-apple-darwin23.0)

BASH VERSION:
3.2.57(1)-release

ASDF VERSION:
v0.14.0

ASDF INTERNAL VARIABLES:
ASDF_DEFAULT_TOOL_VERSIONS_FILENAME=.tool-versions
ASDF_DATA_DIR=/Users/matsumotokanta/.asdf
ASDF_DIR=/opt/homebrew/opt/asdf/libexec
ASDF_CONFIG_FILE=/Users/matsumotokanta/.asdfrc

ASDF INSTALLED PLUGINS:
python https://github.com/danhper/asdf-python.git master 5e277e2
```

### To Reproduce

1. Install asdf 0.13.1 by Homebrew
2. Install asdf-python
3. Install some version of python
4. `brew update`
5. `brew upgrade`
6. Then asdf is updated from 0.13.1 to 0.14.0

### Describe the Bug

I ran `python --version`.
Then I got the following error:

```
$HOME/.asdf/shims/python: line 3: /opt/homebrew/Cellar/asdf/0.13.1/libexec/bin/asdf: No such file or directory
```

So I edited `$HOME/.asdf/shims/python` to modify the version of asdf.

I feel this is a bug.

### Expected Behaviour

When `brew upgrade` upgrades asdf, the script should modify the installed shims script to update the version of asdf.

まず、$HOME/.asdf/shims/python と、Homebrew のアップグレード手順に関連する asdf-python プラグインの shim の動作を調査します。asdf 0.13.1 から 0.14.0 へのアップグレードを再現し、その後、shim を手動で編集しなくても python --version の実行が機能することを確認します。

索引モデルが issue の本文から書いたものです。