Espressif.kicad_sym is too new for KiCad 6

[scottbez1]

It looks like #75 potentially inadvertently updated the symbol library file version from 20211014 to 20220914. This is newer than KiCad 6 and prevents the library from being used in KiCad 6, which contradicts the README: "The libraries in this repository are intended to be used with KiCad version 6."

https://github.com/espressif/kicad-libraries/pull/75/files#diff-6baf09fc71704e53002684da5f4d513448f657a453d74b5e3561ae2046c733cdL1

I'm able to load the library if I manually change the version back to 20211014, though I'm not sure if that PR included any other changes to the file that rely on newer KiCad behavior, so I'm not certain it's completely safe to revert just the version.