Log Message:
py-multipart: updated to 1.2.1

Release 1.2

This release improves error handling, documentation and performance, fixes
several parser edge-cases and adds new functionality. API changes are backwards
compatible.

* feat: Split up `MultipartError`` into more specific exceptions and add HTTP
  status code hints. All exceptions are subclasses of `MultipartError`.
* feat: New `parse_form_data(ignore_errors)` parameter to throw exceptions in
  non-strict mode, or suppress exceptions in strict mode. Default behavior does
  not change (throw in strict-mode, ignore in non-strict mode).
* feat: New `is_form_request(environ)` helper.
* feat: New specialized `content_disposition_[un]quote` functions.
* feat: `parse_options_header()` can now use different unquote functions. The
  default does not change.
* fix: `parse_form_data()` no longer checks the request method and the new
  `is_form_request` function also ignores it. All methods can carry parse-able
  form data, including unknown methods. The only reliable way is to check the
  `Content-Type` header, which both functions do.
* fix: First boundary not detected if separated by chunk border.
* fix: Allow CRLF in front of first boundary, even in strict mode.
* fix: Fail fast if first boundary is broken or part of the preamble.
* fix: Fail if stream ends without finding any boundary at all.
* fix: Use modern WHATWG quoting rules for field names and filenames.
  Legacy quoting is still supported as a fallback.
* fix: `MultiDict.get(index=999)` should return default value, not throw IndexError.
* docs: Lots of work on docs and docstrings.
* perf: Multiple small performance improvements
* build: Require Python 3.8