Squidward Footstep Sounds

The v1.0.1 update was pulled because I forgot to actually update the sounds, and the version number was also incorrect. Apologies.

Additions:

• Added the sound cues from 1.21.9 and a few missing ones

Metadata:

• Made the flavor text for the supported version range more distinct

• The pack.mcmeta is up to date with the new format changes (pack_format is now 64 aka 1.21.8 and supported_formats minimum is now 15 aka 1.20, but it still retains all backwards-compatibility)