Remove references to Random.GLOBAL_RNG

[jakobnissen]

This object is undocumented internals, and is replaced by default_rng().

[codecov]

Codecov Report

Base: 88.54% // Head: 91.22% // Increases project coverage by +2.68% 🎉

Coverage data is based on head (829b572) compared to base (1cfea08).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #265      +/-   ##
==========================================
+ Coverage   88.54%   91.22%   +2.68%     
==========================================
  Files          31       31              
  Lines        2330     2394      +64     
==========================================
+ Hits         2063     2184     +121     
+ Misses        267      210      -57     

Flag	Coverage Δ
unittests	91.22% <100.00%> (+2.68%)	⬆️

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

Impacted Files	Coverage Δ
src/longsequences/randseq.jl	100.00% <100.00%> (ø)
src/BioSequences.jl	100.00% <0.00%> (ø)
src/search/re.jl	87.13% <0.00%> (+0.96%)	⬆️
src/search/ApproxSearchQuery.jl	96.77% <0.00%> (+1.07%)	⬆️
src/bit-manipulation/bit-manipulation.jl	84.61% <0.00%> (+1.92%)	⬆️
src/bit-manipulation/bitindex.jl	88.23% <0.00%> (+2.94%)	⬆️
src/alphabet.jl	88.23% <0.00%> (+3.52%)	⬆️
src/biosequence/printing.jl	79.48% <0.00%> (+5.12%)	⬆️
src/geneticcode.jl	86.60% <0.00%> (+14.13%)	⬆️
src/bit-manipulation/bitpar-compiler.jl	93.38% <0.00%> (+22.54%)	⬆️
... and 1 more

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