Update E3SM-Project submodule

This merge updates the E3SM-Project submodule from [31e0924](https://github.com/E3SM-Project/E3SM/tree/31e0924) to [8939709](https://github.com/E3SM-Project/E3SM/tree/8939709).

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#6263
- [ ]  (ocn) E3SM-Project/E3SM#6310
- [ ]  (fwk) E3SM-Project/E3SM#6427
- [ ]  (ocn) E3SM-Project/E3SM#6397
- [ ]  (ocn) E3SM-Project/E3SM#6306
- [ ]  (ocn) E3SM-Project/E3SM#6454