mark mamba 1.4.8 as broken

[jaimergp]

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@conda-forge/mamba @wolfv @beckermr - this should fix the problems we are seeing in the libcfgraph workflows. They started failing shortly after mamba 1.4.8 was released, with:

missing key conda-forge in channels: {'https://conda.anaconda.org/conda-forge/linux-64': {'platform': 'linux-64', 'url': 'https://conda.anaconda.org/conda-forge/linux-64', 'channel': conda-forge[linux-64,noarch], 'needs_finalising': False}, 'https://conda.anaconda.org/conda-forge/noarch': {'platform': 'noarch', 'url': 'https://conda.anaconda.org/conda-forge/noarch', 'channel': conda-forge[linux-64,noarch], 'needs_finalising': False}}

# >>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<

    Traceback (most recent call last):
      File "/opt/conda/lib/python3.10/site-packages/conda/exception_[handler.py](http://handler.py/)", line 16, in __call__
        return func(*args, **kwargs)
      File "/opt/conda/lib/python3.10/site-packages/mamba/[mamba.py](http://mamba.py/)", line 926, in exception_converter
        raise e
      File "/opt/conda/lib/python3.10/site-packages/mamba/[mamba.py](http://mamba.py/)", line 919, in exception_converter
        exit_code = _wrapped_main(*args, **kwargs)
      File "/opt/conda/lib/python3.10/site-packages/mamba/[mamba.py](http://mamba.py/)", line 877, in _wrapped_main
        result = do_call(parsed_args, p)
      File "/opt/conda/lib/python3.10/site-packages/mamba/[mamba.py](http://mamba.py/)", line 748, in do_call
        exit_code = install(args, parser, "install")
      File "/opt/conda/lib/python3.10/site-packages/mamba/[mamba.py](http://mamba.py/)", line 559, in install
        conda_transaction = to_txn(
      File "/opt/conda/lib/python3.10/site-packages/mamba/[utils.py](http://utils.py/)", line 464, in to_txn
        final_precs = compute_final_precs(
      File "/opt/conda/lib/python3.10/site-packages/mamba/[utils.py](http://utils.py/)", line 410, in compute_final_precs
        raise ValueError("missing key {} in channels: {}".format(key, lookup_dict))
    ValueError: missing key conda-forge in channels: {'https://conda.anaconda.org/conda-forge/linux-64': {'platform': 'linux-64', 'url': 'https://conda.anaconda.org/conda-forge/linux-64', 'channel': conda-forge[linux-64,noarch], 'needs_finalising': False}, 'https://conda.anaconda.org/conda-forge/noarch': {'platform': 'noarch', 'url': 'https://conda.anaconda.org/conda-forge/noarch', 'channel': conda-forge[linux-64,noarch], 'needs_finalising': False}}