[Snyk] Security upgrade express from 4.18.3 to 4.21.1

[sidhantpanda]

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

Snyk changed the following file(s):

• package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Cross-site Scripting (XSS) SNYK-JS-COOKIE-8163060	601

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[github-actions]

The code patch you provided seems to be a package.json file snippet where the version of the "express" package is being updated from "4.18.3" to "4.21.1". Here is a brief code review:

Potential issues:

1. Breaking Changes: Update from Express 4.18.3 to 4.21.1 might include breaking changes. It's important to review the Express release notes to ensure compatibility with your existing codebase.

Improvement Suggestions:

1. Dependency Update: Regularly update dependencies to leverage bug fixes, security patches, and performance improvements in newer versions.

2. Lockfile Update: After changing package versions in package.json, remember to sync the changes with the package-lock.json or yarn.lock file for consistent dependency resolution across environments.

3. Testing: Thoroughly test your application after upgrading a major dependency like Express to ensure all functionalities work as expected.

4. Automated Tests: If available, run automated tests to catch any regressions introduced by the version increment.

5. Continuous Integration (CI): Integrate this change into your CI/CD pipeline to automate testing and deployment processes.

Since the code patch is just a version update, there shouldn't be any immediate concerns except for potential compatibility issues due to the new version.