Bump elliptic from 6.5.0 to 6.5.3 in /webapp (#186)

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.0 to 6.5.3.
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](indutny/elliptic@v6.5.0...v6.5.3)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>