python: rules_python 0.22.0 -> 0.22.1 soas to register Python toolchain by default #20514
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A regression from upgrading to rules_python 0.22.0 is that a Python toolchain is no longer registered by default (the prior 0.4.0 version registered the "autodetecting" toolchain). Subsequent versions of rules_python (0.23.0 or later) register a toolchain by default again, but it's a downloaded runtime, which makes upgrading more involved.
To fix, upgrade to 0.22.1, which registers the autodetecting toolchain. This restores the rules_python 0.4.0 behavior and should suffice until bazel_tools is upgraded to 0.23.0 or later.