Update to 2.2.3 and include back port of exFat fix

This back ports a beta fix from https://github.com/greiman/SdFat-beta/releases/tag/2.3.1-beta.3
Preallocated files on exFat formatted SD card were not reporting their proper size according to greiman#527 (comment)

This release includes the GPT and NoAruduino features for ZuluSCSI and ZuluIDE.

What's Changed

• Fix exFat code reporting incorrect file size for preallocated files by @morio in #2

Full Changelog: 2.2.3-gpt...2.2.3-gpt-exfat