Forks have been removed in cocotb

[toddstrader]

But cocotb-bus still uses them: https://github.com/cocotb/cocotb-bus/blob/2c846dca8d3293b7676c70dd51dbc9c7f51029f0/src/cocotb_bus/drivers/init.py#L48

cocotb-bus does seem to understand it can't tolerate cocotb 2.0: https://github.com/cocotb/cocotb-bus/blob/2c846dca8d3293b7676c70dd51dbc9c7f51029f0/setup.py#L33

but it is now not possible to run HEAD-to-HEAD.

For reference: https://github.com/cocotb/cocotb/pull/3425