Bump pepjs from 0.5.2 to 0.5.3 (#2550)
Bumps [pepjs](https://github.com/jquery/PEP) from 0.5.2 to 0.5.3.
- [Release notes](https://github.com/jquery/PEP/releases)
- [Commits](https://github.com/jquery/PEP/commits/0.5.3)
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