fix(bytes): allow to concat() readonly arrays of bytes arrays

[ngasull]

concat currently only allows mutable arrays whereas it doesn't mutate its input.

This PR expands the signature to read-only arrays.

Doesn't refer to any open issue.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.75%. Comparing base (6a00d6c) to head (81380a2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6639   +/-   ##
=======================================
  Coverage   94.75%   94.75%           
=======================================
  Files         584      584           
  Lines       46563    46563           
  Branches     6541     6541           
=======================================
+ Hits        44119    44120    +1     
+ Misses       2401     2400    -1     
  Partials       43       43           

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[kt3k]

LGTM. Thanks!