Bump submods/amrex from 748f8df to 5d02c64 (Exawind#1067)

Bumps [submods/amrex](https://github.com/AMReX-Codes/amrex) from `748f8df` to `5d02c64`.
- [Release notes](https://github.com/AMReX-Codes/amrex/releases)
- [Commits](AMReX-Codes/amrex@748f8df...5d02c64)

---
updated-dependencies:
- dependency-name: submods/amrex
  dependency-type: direct:production
...

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