Update environment to PHP8.1

[jakejackson1]

Description

Also fix conditional logic notice.

Testing instructions

Let our automated tests handle this.

Screenshots

Checklist:

• [ ] I've tested the code.
• [ ] My code is easy to read, follow, and understand
• [ ] My code follows the accessibility standards.
• [ ] My code has proper inline documentation / docblocks.

Additional Comments

[codecov[bot]]

Codecov Report

Merging #1422 (5a8101e) into development (11f4d46) will not change coverage. The diff coverage is 100.00%.

@@              Coverage Diff               @@
##             development    #1422   +/-   ##
==============================================
  Coverage          78.13%   78.13%           
- Complexity          2922     2923    +1     
==============================================
  Files                243      243           
  Lines              10188    10188           
  Branches             370      370           
==============================================
  Hits                7960     7960           
  Misses              2220     2220           
  Partials               8        8           

Impacted Files	Coverage Δ
src/Model/Model_Form_Settings.php	92.59% <100.00%> (ø)

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