由于在更新brew时遇到问题，因此决定重装brew

1. 卸载原有brew

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"

中间可能需要输入密码，忽略可能出现的warning，直到最后卸载成功

2. 安装新的brew

/bin/zsh -c "$(curl -fsSL https://gitee.com/cunkai/HomebrewCN/raw/master/Homebrew.sh)"

这里我选择了中科大下载源

国内镜像我选择了清华国内源

3. 生效配置 && 查看brew版本

source /Users/<本机用户名>/.bash_profile

查看brew版本，安装成功！整个过程非常舒适

$ brew -v
Homebrew 3.4.9-19-g607c7b6
Homebrew/homebrew-core (git revision e937ec006ef; last commit 2022-04-29)
Homebrew/homebrew-cask (git revision e44655f630; last commit 2022-04-29)

再次安装isl软件包继续报错

$ brew install isl
# ...
==> Running `brew cleanup isl`...
Disable this behaviour by setting HOMEBREW_NO_INSTALL_CLEANUP.
Hide these hints with HOMEBREW_NO_ENV_HINTS (see `man brew`).

按照提示输入以下命令

$ export HOMEBREW_NO_INSTALL_CLEANUP=TRUE

再次重装该软件包即可成功

参考文献
[1] mac下Homebrew安装Fetching /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask failed报错解决方法