[Snyk] Security upgrade express from 4.21.0 to 4.21.2

[ludeknovy]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Regular Expression Denial of Service (ReDoS) SNYK-JS-PATHTOREGEXP-8482416	721

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• Check the changes in this PR to ensure they won't cause issues with your project.
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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Regular Expression Denial of Service (ReDoS)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.09%. Comparing base (d24a17b) to head (f0dfe31).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #352   +/-   ##
=======================================
  Coverage   53.09%   53.09%           
=======================================
  Files         102      102           
  Lines        1699     1699           
  Branches      155      155           
=======================================
  Hits          902      902           
  Misses        778      778           
  Partials       19       19           

Flag	Coverage Δ
unittests	53.09% <ø> (ø)

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