Goof: Make Slack wrapper use double tildes ~~ to encode a strikethrough

[amotl]

Problem

Apparently, Slack adjusted their markup syntax for encoding strikethrough-formatted text. It needs to use two tilde characters ~~ now. Let's fix forward.

Notes

See also "Markdown, Strikethrough, and Slack" [1].

[1] https://daringfireball.net/linked/2015/11/05/markdown-strikethrough-slack

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 29a02028-eb9c-44a8-a6e3-b79d1b6d981f

📥 Commits

Reviewing files that changed from the base of the PR and between 00cad26 and 72ffb69.

📒 Files selected for processing (2)

• CHANGES.md
• src/rapporto/source/github/attention.py

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• Create PR with unit tests
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.40%. Comparing base (00cad26) to head (72ffb69).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #64   +/-   ##
=======================================
  Coverage   56.40%   56.40%           
=======================================
  Files          28       28           
  Lines        1982     1982           
=======================================
  Hits         1118     1118           
  Misses        864      864           

Flag	Coverage Δ
unittests	56.40% <100.00%> (ø)

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