docs(matches): add ReDoS note to README

[WikiRik]

This PR adds a small note to the README for matches to warn the user that they can be vulnerable to ReDoS (Regular Expression Denial of Service) attacks if they let users define their own pattern.

To reduce the amount of PRs needed, I have also prepared a new release in this PR. Unlike the other PRs, we should not squash and merge this PR so we can keep commits separate.

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)
• References provided in PR (where applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6531047) to head (41944ab).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2640   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          114       114           
  Lines         2572      2572           
  Branches       651       651           
=========================================
  Hits          2572      2572           

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