[MRG+1] Simplify version reporting

[elacuesta]

After the recent updates of #3892 the minimum package versions for w3lib and pyOpenSSL were upgraded beyond the cases considered in the existing checks, I think those checks are not needed anymore.

Also, I'm sure there is a historical reason for catching ImportError on cryptography, but it is also required in setup.py so it should always be available for import.

[codecov]

Codecov Report

Merging #3946 into master will increase coverage by 0.2%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #3946     +/-   ##
=========================================
+ Coverage   84.96%   85.16%   +0.2%     
=========================================
  Files         166      167      +1     
  Lines        9681     9734     +53     
  Branches     1445     1457     +12     
=========================================
+ Hits         8225     8290     +65     
+ Misses       1194     1182     -12     
  Partials      262      262

Impacted Files	Coverage Δ
scrapy/utils/versions.py	100% <100%> (+21.42%)	⬆️
scrapy/utils/ssl.py	52.5% <100%> (+5.27%)	⬆️
scrapy/utils/project.py	75.43% <0%> (-0.93%)	⬇️
scrapy/http/request/__init__.py	100% <0%> (ø)	⬆️
scrapy/utils/curl.py	100% <0%> (ø)
scrapy/extensions/feedexport.py	81.65% <0%> (+3.21%)	⬆️

[kmike]

👍