Bump jwcrypto from 1.0 to 1.4 in /backend

Bumps [jwcrypto](https://github.com/latchset/jwcrypto) from 1.0 to 1.4.
- [Release notes](https://github.com/latchset/jwcrypto/releases)
- [Commits](latchset/jwcrypto@v1.0.0...v1.4.0)

---
updated-dependencies:
- dependency-name: jwcrypto
  dependency-type: direct:production
...

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