typing: suppress bogus pytype errors in `mercurial/wireprotoframing.py`

This fixes:

    File "/mnt/c/Users/Matt/hg/mercurial/wireprotoframing.py", line 480, in createalternatelocationresponseframe:
        unsupported operand type(s) for item assignment: bytes [unsupported-operands]
      No attribute '__setitem__' on bytes
    File "/mnt/c/Users/Matt/hg/mercurial/wireprotoframing.py", line 510, in createcommanderrorresponse:
        unsupported operand type(s) for item assignment: bytes [unsupported-operands]
      No attribute '__setitem__' on bytes
    File "/mnt/c/Users/Matt/hg/mercurial/wireprotoframing.py", line 776, in __init__:
        Can't find module 'mercurial.zstd'. [import-error]
    File "/mnt/c/Users/Matt/hg/mercurial/wireprotoframing.py", line 804, in __init__:
        Can't find module 'mercurial.zstd'. [import-error]
    File "/mnt/c/Users/Matt/hg/mercurial/wireprotoframing.py", line 834, in populatestreamencoders:
        Can't find module 'mercurial.zstd'. [import-error]

Using `TypedDict` is tempting here to fix the first two, but requires str keys.
The code doing the importing doesn't call the code at the other three locations
if the `mercurial.zstd` module fails to import in a place that handles the
ImportError.

mercurial/wireprotoframing.py

@@ -477,7 +477,9 def createalternatelocationresponseframe
     ):
         value = getattr(location, a)
         if value is not None:
+            # pytype: disable=unsupported-operands
             data[b'location'][pycompat.bytestr(a)] = value
+            # pytype: enable=unsupported-operands
 
     payload = b''.join(cborutil.streamencode(data))
 
@@ -507,7 +509,7 def createcommanderrorresponse(stream, r
     }
 
     if args:
-        m[b'error'][b'args'] = args
+        m[b'error'][b'args'] = args  # pytype: disable=unsupported-operands
 
     overall = b''.join(cborutil.streamencode(m))
 
@@ -773,7 +775,7 class zlibdecoder:
 
 class zstdbaseencoder:
     def __init__(self, level):
-        from . import zstd
+        from . import zstd  # pytype: disable=import-error
 
         self._zstd = zstd
         cctx = zstd.ZstdCompressor(level=level)
@@ -801,7 +803,7 class zstd8mbencoder(zstdbaseencoder):
 
 class zstdbasedecoder:
     def __init__(self, maxwindowsize):
-        from . import zstd
+        from . import zstd  # pytype: disable=import-error
 
         dctx = zstd.ZstdDecompressor(max_window_size=maxwindowsize)
         self._decompressor = dctx.decompressobj()
@@ -831,7 +833,7 def populatestreamencoders():
         return
 
     try:
-        from . import zstd
+        from . import zstd  # pytype: disable=import-error
 
         zstd.__version__
     except ImportError: