Test against WordPress 6.0

[vikrampm1]

Is your enhancement related to a problem? Please describe.
Once WordPress 6.0 is released, we'll want to test Simple Local Avatars to see if any incompatibility issues arise.

Describe the solution you'd like

• test Simple Local Avatars on WordPress 6.0
• open issues for any incompatibilities noted in testing
• resolve issues identified in testing
• bump "tested up to" version
• if code changes needed due to incompatibilities, ship a plugin release, otherwise use "Plugin asset/readme update" action to update "tested up to" version on .org repo

Designs
n/a

Describe alternatives you've considered
none

Additional context
Related: #66, #56, #42, #35

[ajmaurya99]

I have tested this plugin in WordPress 6.0 version and it is working fine.

WP version : 6.0
Plugin version : 2.2.0
CC: @jeffpaul @faisal-alvi