fix: update express for path-to-regexp vuln

[WalterMoar]

Description

The GitHub Dependabot process has created an alert for the path-to-regexp dependency. To path-to-regexp the requirements outlined in the Security Threat and Risk Assessment's (STRA) Statement of Acceptable Risks (SoAR), this vulnerability must be handled by updating the package version (or mitigated in some other way, if updating the package is not possible).
https://github.com/bcgov/common-hosted-form-service/security/dependabot/218

Acceptance Criteria

• The dependency is updated to a version that does not have the vulnerability

Type of Change

fix (a bug fix)

Checklist

• I have read the CONTRIBUTING doc
• I have checked that unit tests pass locally with my changes
• I have run the npm script lint on the frontend and backend
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have approval from the product owner for the contribution in this pull request