Bump test/bats from a61c90e to b640ec3 (#86)

Bumps [test/bats](https://github.com/bats-core/bats-core) from `a61c90e` to `b640ec3`.
- [Release notes](https://github.com/bats-core/bats-core/releases)
- [Commits](bats-core/bats-core@a61c90e...b640ec3)

---
updated-dependencies:
- dependency-name: test/bats
  dependency-type: direct:production
...

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Author: dependabot[bot]