Bump tzinfo-data from 1.2020.4 to 1.2020.5 (#15448)

Bumps [tzinfo-data](https://github.com/tzinfo/tzinfo-data) from 1.2020.4 to 1.2020.5.
- [Release notes](https://github.com/tzinfo/tzinfo-data/releases)
- [Commits](https://github.com/tzinfo/tzinfo-data/compare/v1.2020.4...v1.2020.5

)

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