Bump waitress from 1.1 to 1.4.3

[dependabot[bot]]

Bumps waitress from 1.1 to 1.4.3.

Changelog

Sourced from waitress's changelog.

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.
1.4.2 (2020-01-02)
Security Fixes

• This is a follow-up to the fix introduced in 1.4.1 to tighten up the way Waitress strips whitespace from header values. This makes sure Waitress won't accidentally treat non-printable characters as whitespace and lead to a potental HTTP request smuggling/splitting security issue.

  Thanks to ZeddYu Lu for the extra test cases.

  Please see the security advisory for more information: https://github.com/Pylons/waitress/security/advisories/GHSA-m5ff-3wj3-8ph4

  CVE-ID: CVE-2019-16789

Bugfixes

- Updated the regex used to validate header-field content to match the errata
  that was published for RFC7230.
See: https://www.rfc-editor.org/errata_search.php?rfc=7230&eid=4189
1.4.1 (2019-12-24)
Security Fixes

• Waitress did not properly validate that the HTTP headers it received were

Commits

• cbc89bf Prep v1.4.3
• 6e46f9e Merge pull request from GHSA-73m2-3pwg-5fgc
• 51b9bd4 Remove accidental backslash
• f87abb7 Add bad header that caused catastrophic backtracking
• 2fe8e54 Add header parsing tests with short headers
• ac0ca05 Remove catastrophic backtracking in regex
• 8af9adb Prep for 1.4.2
• 634d991 Merge pull request #277 from Pylons/invalid-whitespace-cont
• 3a54e29 Add CHANGES and bump version to 1.4.2
• 0bf98da Update RFC7230 regex with errata for header field-content
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #35.