Update the E3SM-Project submodule

This merge updates the E3SM-Project submodule from [c7d7998](https://github.com/E3SM-Project/E3SM/tree/c7d7998) to [727ad81](https://github.com/E3SM-Project/E3SM/tree/727ad81).

This update includes the following MPAS-Ocean and MPAS-Frameworks PRs (check mark indicates bit-for-bit with previous PR in the list):
- [ ]  (ocn) E3SM-Project/E3SM#6456
- [ ]  (ocn) E3SM-Project/E3SM#6510
- [ ]  (ocn) E3SM-Project/E3SM#6535