fix: 修复魔术方法调用predis没有返回值

[xuliangTang]

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[codecov]

Codecov Report

Merging #11 (8be1107) into main (1206916) will not change coverage.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##               main      #11   +/-   ##
=========================================
  Coverage     59.72%   59.72%           
  Complexity       20       20           
=========================================
  Files             4        4           
  Lines            72       72           
=========================================
  Hits             43       43           
  Misses           29       29           

Impacted Files	Coverage Δ
src/Redis.php	71.18% <0.00%> (ø)