我想升级到Flutter 3.7，这样我就可以开始使用Serverpod（需要3.7版本）。然而，当我执行flutter upgrade时，它说：

Flutter is already up to date on channel stable
Flutter 3.16.5 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 78666c8dc5 (2 weeks ago) • 2023-12-19 16:14:14 -0800
Engine • revision 3f3e560236
Tools • Dart 3.2.3 • DevTools 2.28.4

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我准备好了，为了升级到3.7，你需要安装Flutter版本管理器。所以我做了，这是结果：

dart pub global activate fvm
Package fvm is currently active at version 2.4.1.
The package fvm is already activated at newest available version.
To recompile executables, first run `dart pub global deactivate fvm`.
Installed executable fvm.
Warning: Pub installs executables into $HOME/.pub-cache/bin, which is not on your path.
You can fix that by adding this to your shell's config file (.bashrc, .bash_profile, etc.):

  export PATH="$PATH":"$HOME/.pub-cache/bin"

Activated fvm 2.4.1.

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但是当我执行fvm install 3.7.16时，它返回：

zsh: command not found: fvm

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为什么它说未找到命令，我如何修复它？