[Snyk] Security upgrade express from 4.17.3 to 4.21.1

Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
- package.json
- package-lock.json

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	601/1000 Why? Recently disclosed, Has a fix available, CVSS 6.3	Cross-site Scripting (XSS) SNYK-JS-COOKIE-8163060	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: express

The new version differs by 189 commits.

8e229f9 4.21.1
a024c8a fix(deps): cookie@0.7.1
7e562c6 4.21.0
1bcde96 fix(deps): qs@6.13.0 (#5946)
7d36477 fix(deps): serve-static@1.16.2 (#5951)
40d2d8f fix(deps): finalhandler@1.3.1
77ada90 Deprecate `"back"` magic string in redirects (#5935)
21df421 4.20.0
4c9ddc1 feat: upgrade to serve-static@0.16.0
9ebe5d5 feat: upgrade to send@0.19.0 (#5928)
ec4a01b feat: upgrade to body-parser@1.20.3 (#5926)
54271f6 fix: don't render redirect values in anchor href
125bb74 path-to-regexp@0.1.10 (#5902)
2a980ad merge-descriptors@1.0.3 (#5781)
a3e7e05 docs: specify new instructions for `question` and `discuss`
c5addb9 deps: path-to-regexp@0.1.8 (#5603)
e35380a docs: add @ IamLizu to the triage team (#5836)
f5b6e67 docs: update scorecard link (#5814)
2177f67 docs: add OSSF Scorecard badge (#5436)
f4bd86e Replace Appveyor windows testing with GHA (#5599)
2ec589c Fix Contributor Covenant link definition reference in attribution section (#5762)
4cf7eed remove minor version pinning from ci (#5722)
6d08471 📝 update people, add ctcpip to TC (#5683)
61421a8 skip QUERY tests for Node 21 only, still not supported (#5695)

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