Bump version to 3.0.0a2

[ischoegl]

Changes proposed in this pull request

After the merge of #1333 (i.e. CTI/XML are completely removed and remaining Reaction specializations are deprecated, plus yaml2ck is merged), it may be time for updating the alpha version.

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[speth]

Agreed, it's about time for this, what with almost 200 commits since v2.6.0.

However, you forgot about the version number in README.rst.

[codecov]

Codecov Report

Merging #1337 (2328d8b) into main (a2af8fe) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1337      +/-   ##
==========================================
- Coverage   68.06%   68.01%   -0.05%     
==========================================
  Files         318      327       +9     
  Lines       42010    42603     +593     
  Branches    16883    17143     +260     
==========================================
+ Hits        28594    28978     +384     
- Misses      11150    11345     +195     
- Partials     2266     2280      +14     

Impacted Files	Coverage Δ
include/cantera/numerics/FuncEval.h	57.89% <0.00%> (-26.73%)	⬇️
src/numerics/FuncEval.cpp	29.16% <0.00%> (-20.84%)	⬇️
src/kinetics/Reaction.cpp	80.08% <0.00%> (-7.93%)	⬇️
include/cantera/zeroD/Reactor.h	59.09% <0.00%> (-5.91%)	⬇️
src/kinetics/ReactionRateFactory.cpp	89.65% <0.00%> (-3.45%)	⬇️
include/cantera/kinetics/ReactionRate.h	80.39% <0.00%> (-1.25%)	⬇️
include/cantera/zeroD/ReactorBase.h	58.53% <0.00%> (-0.44%)	⬇️
src/kinetics/InterfaceKinetics.cpp	73.75% <0.00%> (-0.24%)	⬇️
src/kinetics/Kinetics.cpp	69.32% <0.00%> (-0.10%)	⬇️
src/kinetics/Arrhenius.cpp	96.38% <0.00%> (-0.05%)	⬇️
... and 26 more

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[ischoegl]

@speth ... thanks for noticing! This should probably wait until #1338 is merged to include the updated third-body detection logic.