Add moveit-servo for linux_64

[etaoxing]

Trying to resolve the following error (doesn't exist in robostack-staging channel):

$ mamba install ros-noetic-moveit-servo
...
Could not solve for environment specs
The following package could not be installed
└─ ros-noetic-moveit-servo   does not exist (perhaps a typo or a missing channel).

Using robostack channel:

$ mamba install -c robostack ros-noetic-moveit-servo
...
Invalid spec, no package name found: NULL>

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

    Traceback (most recent call last):
      File "/home/eliotx/miniconda3/lib/python3.10/site-packages/conda/exception
s.py", line 1132, in __call__
        return func(*args, **kwargs)
      File "/home/eliotx/miniconda3/lib/python3.10/site-packages/mamba/mamba.py"
, line 941, in exception_converter
        raise e
      File "/home/eliotx/miniconda3/lib/python3.10/site-packages/mamba/mamba.py"
, line 934, in exception_converter
        exit_code = _wrapped_main(*args, **kwargs)
      File "/home/eliotx/miniconda3/lib/python3.10/site-packages/mamba/mamba.py"
, line 892, in _wrapped_main
        result = do_call(parsed_args, p)
      File "/home/eliotx/miniconda3/lib/python3.10/site-packages/mamba/mamba.py"
, line 754, in do_call
        exit_code = install(args, parser, "install")
      File "/home/eliotx/miniconda3/lib/python3.10/site-packages/mamba/mamba.py"
, line 560, in install
        print(solver.explain_problems())
    RuntimeError: Invalid spec, no package name found: NULL>

[etaoxing]

Only added for linux_64, according to the compatibility table.

@Tobias-Fischer

[wolfv]

thanks!