generateRandomToken improvement.

[michaellrowley]

The MD5 call altogether has been switched out for the hexadecimal representation of 16 CSRNG-generated bytes (the same amount at MD5 produces).
See this.

[codecov]

Codecov Report

Merging #1176 (3aff283) into hotfix (5b50529) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             hotfix    #1176      +/-   ##
============================================
- Coverage     70.68%   70.68%   -0.01%     
  Complexity     1984     1984              
============================================
  Files           173      173              
  Lines          6911     6910       -1     
============================================
- Hits           4885     4884       -1     
  Misses         2026     2026              

Impacted Files	Coverage Δ
...rinkles/account/src/Repository/TokenRepository.php	62.68% <100.00%> (ø)
app/sprinkles/core/src/Util/Captcha.php	100.00% <100.00%> (ø)

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[lcharette]

N.B.: This will need to be properly (manually) tested to make sure the existing token (if any) are not impacted and Captcha still properly working.