Bump elliptic from 6.4.1 to 6.5.4 in /IoCWebApiDemo

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.4.1 to 6.5.4. - [Release notes](https://github.com/indutny/elliptic/releases) - [Commits](indutny/elliptic@v6.4.1...v6.5.4) Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]