feat!: bump minimum PHP to 8.1

[greatislander]

No description provided.

[codecov]

Codecov Report

Merging #191 (405a314) into main (60efd9e) will not change coverage.
The diff coverage is n/a.

❗ Current head 405a314 differs from pull request most recent head 0612f68. Consider uploading reports for the commit 0612f68 to get more accurate results

@@            Coverage Diff            @@
##               main     #191   +/-   ##
=========================================
  Coverage     62.89%   62.89%           
  Complexity       91       91           
=========================================
  Files            29       29           
  Lines           504      504           
=========================================
  Hits            317      317           
  Misses          187      187           

Files	Coverage Δ
src/Commands/HearthCommand.php	17.07% <ø> (ø)
src/Components/Checkbox.php	100.00% <ø> (ø)
src/Components/Checkboxes.php	100.00% <ø> (ø)
src/Components/RadioButton.php	100.00% <ø> (ø)
src/Components/TranslatableInput.php	100.00% <ø> (ø)
src/Components/TranslatableTextarea.php	100.00% <ø> (ø)
src/HearthServiceProvider.php	100.00% <ø> (ø)
src/Models/Invitation.php	100.00% <ø> (ø)
src/Models/Membership.php	100.00% <ø> (ø)
src/Traits/AriaDescribable.php	100.00% <ø> (ø)
... and 4 more