Bump @hebcal/core from 3.21.0 to 3.21.1

Bumps [@hebcal/core](https://github.com/hebcal/hebcal-es6) from 3.21.0 to 3.21.1.
- [Release notes](https://github.com/hebcal/hebcal-es6/releases)
- [Commits](https://github.com/hebcal/hebcal-es6/commits)

---
updated-dependencies:
- dependency-name: "@hebcal/core"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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