- Update to 3.9.6:
  * Security
    - bpo-44022: mod:http.client now avoids infinitely reading
      potential HTTP headers after a 100 Continue status response
      from the server.
  * Core and Builtins
    - bpo-44168: Fix error message in the parser involving keyword
      arguments with invalid expressions. Patch by Pablo Galindo
    - bpo-44114: Fix incorrect dictkeys_reversed and
      dictitems_reversed function signatures in C code, which broke
      webassembly builds.
    - bpo-44070: No longer eagerly makes import filenames absolute,
      except for extension modules, which was introduced in 3.9.5.
    - bpo-28146: Fix a confusing error message in str.format().
    - bpo-11105: When compiling ast.AST objects with recursive
      references through compile(), the interpreter doesn’t crash
      anymore instead it raises a RecursionError.
  * Library
    - bpo-43972: When http.server.SimpleHTTPRequestHandler sends a
      301 (Moved Permanently) for a directory path not ending with
      /, add a Content-Length: 0 header. This improves the behavior
      for certain clients.
    - bpo-43776: When subprocess.Popen args are provided as a
      string or as pathlib.Path, the Popen instance repr now shows
      the right thing.
    - bpo-43318: Fix a bug where pdb does not always echo cleared
      breakpoints.
    - bpo-43295: datetime.datetime.strptime() now raises ValueError
      instead of IndexError when matching 'z' with the %z format
      specifier.

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