Bump waitress from 1.4.2 to 1.4.3

Bumps waitress from 1.4.2 to 1.4.3.

Changelog

*Sourced from [waitress's changelog](https://github.com/Pylons/waitress/blob/master/CHANGES.txt).* > 1.4.3 (2020-02-02) > ------------------ > > Security Fixes > ~~~~~~~~~~~~~~ > > - In Waitress version 1.4.2 a new regular expression was added to validate the > headers that Waitress receives to make sure that it matches RFC7230. > Unfortunately the regular expression was written in a way that with invalid > input it leads to catastrophic backtracking which allows for a Denial of > Service and CPU usage going to a 100%. > > This was reported by Fil Zembowicz to the Pylons Project. Please see > https://github.com/Pylons/waitress/security/advisories/GHSA-73m2-3pwg-5fgc > for more information.

Commits

- [`cbc89bf`](https://github.com/Pylons/waitress/commit/cbc89bf742ef7cbca17671ec9acd3898491c378f) Prep v1.4.3 - [`6e46f9e`](https://github.com/Pylons/waitress/commit/6e46f9e3f014d64dd7d1e258eaf626e39870ee1f) Merge pull request from GHSA-73m2-3pwg-5fgc - [`51b9bd4`](https://github.com/Pylons/waitress/commit/51b9bd429a97ac1cadfe4e37938ff7fac84ee642) Remove accidental backslash - [`f87abb7`](https://github.com/Pylons/waitress/commit/f87abb7320d9acfa2c321481b70974363966bfe5) Add bad header that caused catastrophic backtracking - [`2fe8e54`](https://github.com/Pylons/waitress/commit/2fe8e54695ed038dadbb90e03140a1ab395d6629) Add header parsing tests with short headers - [`ac0ca05`](https://github.com/Pylons/waitress/commit/ac0ca050046f1538346f3975487062186195f4ca) Remove catastrophic backtracking in regex - See full diff in [compare view](https://github.com/Pylons/waitress/compare/v1.4.2...v1.4.3)

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ucam-department-of-psychiatry / crate

Bump waitress from 1.4.2 to 1.4.3 #20