Update slack-sdk requirement from <3.15.2,>=3.13.0 to >=3.13.0,<3.19.4

[dependabot[bot]]

Updates the requirements on slack-sdk to permit the latest version.

Release notes

Sourced from slack-sdk's releases.

version 3.19.3

Changes

• #1288 Add datetimepicker, url, email, number block elements - Thanks @​WilliamBergamin
• #1294 Fix #1292 files_upload_v2 does not work with io.BytesIO file parameters - Thanks @​seratch
• #1290 Update RTM API documents - Thanks @​ryan-aldaz

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• All issues/pull requests: https://github.com/slackapi/python-slack-sdk/milestone/72?closed=1
• All changes: https://github.com/slackapi/python-slack-sdk/compare/v3.19.2...v3.19.3

Commits

• 3610592 version 3.19.3
• b32cebb Upgrade pytype and black
• e77312c Add datetimepicker, url, email, number block elements (#1288)
• 71745b0 Fix #1292 files_upload_v2 does not work with io.BytesIO file parameters (#1294)
• db17415 Fix test code for local executions
• 54f05e6 fix-issue-1145 (#1290)
• 2f926a6 Tweak test code
• 2856a3e Tweak test code
• ba0decd version 3.19.2
• 357098c Improve typing when using 'get' on API response (#1283)
• Additional commits viewable in compare view

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[codecov-commenter]

Codecov Report

Merging #842 (34826ee) into develop (6343907) will increase coverage by 10.14%. The diff coverage is n/a.

:exclamation: Current head 34826ee differs from pull request most recent head c6feb07. Consider uploading reports for the commit c6feb07 to get more accurate results

@@             Coverage Diff              @@
##           develop     #842       +/-   ##
============================================
+ Coverage    46.74%   56.89%   +10.14%     
============================================
  Files          195      129       -66     
  Lines         6997     1965     -5032     
  Branches       522      522               
============================================
- Hits          3271     1118     -2153     
+ Misses        3622      743     -2879     
  Partials       104      104               

Impacted Files	Coverage Δ
core/urls.py
frontend/admin.py
integrations/models.py
data_updates/Python/povcal_agg.py
integrations/views.py
data_updates/Python/iati_transaction_spec.py
data/management/commands/run_schedules.py
data/models.py
core/signals/handlers.py
data/db_manager.py
... and 56 more

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[dependabot[bot]]

Superseded by #850.