fix: package.json to reduce vulnerabilities
fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:concat-stream:20160901

Latest report for anvilresearch/oidc-op:
https://snyk.io/test/github/anvilresearch/oidc-op
anvilresearch/oidc-op