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encoding: force a few Errors to bytes before passing to `error.Abort`

Authored by mharbison72.

Description

encoding: force a few Errors to bytes before passing to error.Abort

I'm not sure what changed before pytype 09-09-2021 (from 04-15-2021), but these
started getting flagged. PyCharm also flagged these. This fixes the following:

File "/mnt/c/Users/Matt/hg/mercurial/encoding.py", line 243, in fromlocal: Function Abort.__init__ was called with the wrong arguments [wrong-arg-types]
         Expected: (self, message: Union[bytearray, bytes, memoryview], ...)
  Actually passed: (self, message: LookupError, ...)
File "/mnt/c/Users/Matt/hg/mercurial/encoding.py", line 309, in lower: Function Abort.__init__ was called with the wrong arguments [wrong-arg-types]
         Expected: (self, message: Union[bytearray, bytes, memoryview], ...)
  Actually passed: (self, message: LookupError, ...)
File "/mnt/c/Users/Matt/hg/mercurial/encoding.py", line 336, in upperfallback: Function Abort.__init__ was called with the wrong arguments [wrong-arg-types]
         Expected: (self, message: Union[bytearray, bytes, memoryview], ...)
  Actually passed: (self, message: LookupError, ...)
Called from (traceback):
  line 391, in current file
  line 348, in get
  line 318, in upper

Differential Revision: https://phab.mercurial-scm.org/D11467