Fix: Use `@psalm-var` instead of `@psalm-return`

[localheinz]

This pull request

• [x] uses @psalm-var instead of @psalm-return in the DocBlock for a field

[codecov[bot]]

Codecov Report

Merging #990 (7b8a918) into 10.0 (544e9aa) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##               10.0     #990   +/-   ##
=========================================
  Coverage     85.18%   85.18%           
  Complexity     1177     1177           
=========================================
  Files            69       69           
  Lines          4145     4145           
=========================================
  Hits           3531     3531           
  Misses          614      614           

Impacted Files	Coverage Δ
src/Node/File.php	80.93% <ø> (ø)

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