Increased ESMValCore version to 2.5.0rc2

[schlunma]

Checklist

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[valeriupredoi]

you're not messing about, more RC's in one day than Audi makes cars in one day 😆

[schlunma]

😄

Since the conda-forge issue is still not resolved we can push this and do the recipe testing with rc2 to save ressources 👍

[codecov]

Codecov Report

Merging #1487 (db4bb32) into main (8f95341) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1487   +/-   ##
=======================================
  Coverage   90.71%   90.71%           
=======================================
  Files         197      197           
  Lines       10517    10517           
=======================================
  Hits         9541     9541           
  Misses        976      976           

Impacted Files	Coverage Δ
esmvalcore/_version.py	100.00% <100.00%> (ø)

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