Bump re2 from 1.15.8 to 1.15.9

Bumps [re2](https://github.com/uhop/node-re2) from 1.15.8 to 1.15.9.
- [Release notes](https://github.com/uhop/node-re2/releases)
- [Commits](https://github.com/uhop/node-re2/compare/1.15.8...1.15.9

)

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