fix phpstan errors

[mimmi20]

No description provided.

[codecov]

Codecov Report

Merging #2603 (cb8c0a8) into 6.0.x (b0f8424) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              6.0.x    #2603   +/-   ##
=========================================
  Coverage     50.83%   50.83%           
  Complexity      856      856           
=========================================
  Files          1818     1818           
  Lines         67338    67339    +1     
  Branches      30699    30699           
=========================================
+ Hits          34233    34234    +1     
  Misses        33105    33105           

Flag	Coverage Δ
full	45.84% <ø> (ø)
lite	2.11% <ø> (ø)
standard	26.52% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Browscap/Data/Expander.php	86.95% <100.00%> (+0.05%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b0f8424...cb8c0a8. Read the comment docs.