[Gravity] Fix phpstan level 3 issues

Review Request #1123 — Created Feb. 27, 2024 and submitted

pprkut
Lunr.Gravity
f53332d...
lunr

Fix phpstan level 3 issues

GitHub actions run: https://github.com/pprkut/lunr.gravity/actions/runs/8064874954

b.stoop
  1. Ship It!
  2. 
      
pprkut
Review request changed

Status: Closed (submitted)

Change Summary:

Merged into master

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