Use "any" instead of "interface{}"

[Jacalz]

Description:

Code style change. I switched all uses over when we migrated to Go 1.19 as base but a few uses of the old name have slipped through since then. Change them to "any".

Checklist:

• Tests included.
• Lint and formatter run with no errors.
• Tests all pass.

[coveralls]

coverage: 59.66% (+0.01%) from 59.65%
when pulling 3a0c4ef on Jacalz:use-any-instead-of-empty-interface
into 0afa6a9 on fyne-io:develop.