DRAFT: bump poi

[colearendt]

Switch to using POI 5.2.0

LOTS of changes required:

• lots of things we treated like enums are now officially enums
• a handful of changed method signatures
• attempted to keep most of the xlsx API the same. However, we did start treating enums in a more friendly fashion and using the (personally preferable) snake_case syntax... not sure yet whether this inconsistency is a problem...

Remaining work:

• [ ] Address cellBlock changes (this requires getting a java environment set up)
• [ ] figure out why the addHyperlink call is failing. The method signature looks perfect. Is this an issue in POI?
• [ ] password protection issue
• [ ] read.xlsx / write.xlsx seem to have some issues / changes