Prepare 21.10 release

[y0urself]

What:

Why:

How:

Checklist:

• Tests
• CHANGELOG Entry
• Documentation

[codecov]

Codecov Report

Merging #575 (bdd139d) into main (15a6cb0) will decrease coverage by 0.04%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main     #575      +/-   ##
==========================================
- Coverage   98.83%   98.78%   -0.05%     
==========================================
  Files          54       55       +1     
  Lines        3947     3957      +10     
  Branches      934      935       +1     
==========================================
+ Hits         3901     3909       +8     
- Misses         34       35       +1     
- Partials       12       13       +1     

Impacted Files	Coverage Δ
gvm/protocols/gmp.py	94.73% <71.42%> (-5.27%)	⬇️
gvm/protocols/gmpv2110/system/version.py	100.00% <100.00%> (ø)
gvm/protocols/latest.py	100.00% <100.00%> (ø)
gvm/protocols/next.py	100.00% <100.00%> (ø)

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