Updates to MDAnalysis v2.0.0 and CI

[joaomcteixeira]

• Updates MDAnalysis dependency to v 2.0.0.
• Defines version numbers for other dependencies
• updates CI (try to reach to python 3.9, lets see if it is possible)

Motivation #57

[codecov-commenter]

Codecov Report

Merging #58 (b558098) into master (94b35c6) will increase coverage by 0.17%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master       #58      +/-   ##
===========================================
+ Coverage   99.82%   100.00%   +0.17%     
===========================================
  Files          21        21              
  Lines        1114      1122       +8     
  Branches       84        84              
===========================================
+ Hits         1112      1122      +10     
+ Misses          2         0       -2     

Impacted Files	Coverage Δ
src/taurenmd/cli_trajedit.py	100.00% <100.00%> (ø)
src/taurenmd/libs/libmda.py	100.00% <100.00%> (ø)
src/taurenmd/libs/libmdt.py	100.00% <100.00%> (+3.57%)	⬆️
src/taurenmd/libs/libcli.py	100.00% <0.00%> (ø)
src/taurenmd/libs/libplot.py	100.00% <0.00%> (ø)

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