[Snyk] Security upgrade express from 4.19.2 to 4.21.2

[davesag]

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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🦉 Regular Expression Denial of Service (ReDoS)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (aac4b42) to head (9ba84cb).

Additional details and impacted files

@@            Coverage Diff            @@
##           develop      #626   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           16        16           
  Lines          106       106           
=========================================
  Hits           106       106           

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