[v2] Upgrade prompt-toolkit to 3.0.51

[hssyoo]

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Description of changes:

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[hssyoo]

Okay so prompt-toolkit began identifying its version using importlib.metadata.version [source]. There are 2 issues here..

1. The AWS CLI looks for certain path finders and wraps them inside a custom path finder [source]. This prevents prompt-toolkit's metadata from being found at build time and runtime.
2. PyInstaller doesn't copy package metadata by default when building the frozen executable. This prevents prompt-toolkit's metadata from being found at runtime. There's a way to configure this, but I haven't gotten it to work yet [docs].