Bump asteval from 0.9.26 to 0.9.27 (#493)

Bumps [asteval](https://github.com/newville/asteval) from 0.9.26 to 0.9.27.
- [Release notes](https://github.com/newville/asteval/releases)
- [Commits](newville/asteval@0.9.26...0.9.27)

---
updated-dependencies:
- dependency-name: asteval
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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