Bump waitress from 1.4.0 to 1.4.2 in /coding/flask-docker

[dependabot[bot]]

Bumps waitress from 1.4.0 to 1.4.2.

Changelog

Sourced from waitress's changelog.

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 properly formed, thereby potentially allowing a front-end server to treat a request different from Waitress. This could lead to HTTP request smuggling/splitting.

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

  CVE-ID: CVE-2019-16789

Commits

• 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
• ddb65b4 Remove accidental stripping of non-printable characters
• cd83598 Prep v1.4.1
• 11d9e13 Merge pull request from GHSA-m5ff-3wj3-8ph4
• a046a76 Add links to advisories for previous security issues
• 3c58e39 Bump version number
• de3324d Add documentation for security issue
• Additional commits viewable in compare view

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