Fix: ports argument for overrides and notes

[y0urself]

What:

change port to str in overrides and notes:

port: Port to which the override applies, needs to be a string
in the form {number}/{protocol}

Why:

gvmd requires this

How:

Checklist:

• Tests
• CHANGELOG Entry
• Documentation

[codecov]

Codecov Report

Merging #755 (df12f46) into main (73e0400) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #755   +/-   ##
=======================================
  Coverage   98.68%   98.69%           
=======================================
  Files          56       56           
  Lines        4033     4057   +24     
  Branches     1046     1055    +9     
=======================================
+ Hits         3980     4004   +24     
  Misses         39       39           
  Partials       14       14           

Impacted Files	Coverage Δ
gvm/protocols/gmpv208/entities/notes.py	100.00% <100.00%> (ø)
gvm/protocols/gmpv208/entities/overrides.py	100.00% <100.00%> (ø)
gvm/protocols/gmpv214/entities/notes.py	100.00% <100.00%> (ø)
gvm/protocols/gmpv214/entities/overrides.py	100.00% <100.00%> (ø)
gvm/utils.py	100.00% <100.00%> (ø)

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