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This PR limits multimethod version to 2.0 and earlier, and updates the python versions in documentation to address the following issues.
The overload function, required by pandera, has been removed in recent versions of the multimethod package, causing import errors as noted in activitysim 1.3.1 on conda-forge also requires multimethod=1.9 ActivitySim/activitysim#919
Python 3.9 does not support the | operator for type unions, which is used in some sharrow modules. Upgrading to Python 3.10 or later resolves this issue, as mentioned in activitysim 1.2.2 (which is installed if you follow the current docs) doesn't actually run and fails silently ActivitySim/activitysim#921