Refactor scanMulti to only call scan once

[Fs02]

• Refactor scanMulti to only call scan once, adapting recent changes in go 1.21

fix: #336

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (8750e2c) 100.00% compared to head (7d5559a) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #339   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           35        35           
  Lines         2826      2828    +2     
=========================================
+ Hits          2826      2828    +2     

Files Changed	Coverage Δ
collection.go	100.00% <100.00%> (ø)
cursor.go	100.00% <100.00%> (ø)
document.go	100.00% <100.00%> (ø)
util.go	100.00% <100.00%> (ø)

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