Click 8.4.0 breaks type checks

[tbarsballe]

Expected behavior
Prior to May 17, type checks on the repo succeeded

Actual behavior (describe the problem)
After May 17, type checks failed, due to the new release of click 8.4.0, with the following errors:

planet/cli/types.py:27: error: Return type "list[str]" of "convert" incompatible with return type "str" in supertype "click.types.StringParamType"  [override]
planet/cli/types.py:27: error: Return type "list[str]" of "convert" incompatible with return type "str" in supertype "click.types.ParamType"  [override]
planet/cli/types.py:49: error: Return type "list[float]" of "convert" incompatible with return type "str" in supertype "click.types.StringParamType"  [override]
planet/cli/types.py:49: error: Return type "list[float]" of "convert" incompatible with return type "str" in supertype "click.types.ParamType"  [override]

Related Issues
First noticed in #1215

Workaround
Force click<=8.4.0

Environment Information
Observed in multiple environments: local (MacOS), CI.

Installation Method
From source