update qtls to include the crypto/tls fix of Go 1.16.6 / 1.15.14

[marten-seemann]

See https://groups.google.com/g/golang-dev/c/5LJ2V7rd-Ag/m/YGLHVBZ6AAAJ for details.

[codecov]

Codecov Report

Merging #3229 (b3ba6e3) into master (625948e) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3229      +/-   ##
==========================================
- Coverage   85.47%   85.46%   -0.01%     
==========================================
  Files         133      133              
  Lines        9799     9799              
==========================================
- Hits         8375     8374       -1     
- Misses       1051     1052       +1     
  Partials      373      373              

Impacted Files	Coverage Δ
internal/utils/rand.go	62.50% <0.00%> (-12.50%)	⬇️

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