Become 2.10.3

[akx]

This PR cherry-picks #888's commits on top of v2.10.2 and does the usual release dance.

[codecov]

Codecov Report

Merging #889 (5e05c25) into 2.10-maint (24bc2dd) will decrease coverage by 0.62%.
The diff coverage is 100.00%.

❗ Current head 5e05c25 differs from pull request most recent head 0d90241. Consider uploading reports for the commit 0d90241 to get more accurate results

@@              Coverage Diff               @@
##           2.10-maint     #889      +/-   ##
==============================================
- Coverage       91.30%   90.67%   -0.63%     
==============================================
  Files              23       23              
  Lines            4187     4183       -4     
==============================================
- Hits             3823     3793      -30     
- Misses            364      390      +26     

Impacted Files	Coverage Δ
babel/__init__.py	100.00% <100.00%> (ø)
babel/localtime/_win32.py	25.92% <0.00%> (-37.04%)	⬇️
babel/localtime/__init__.py	61.53% <0.00%> (-2.57%)	⬇️
babel/localedata.py	95.04% <0.00%> (-0.83%)	⬇️
babel/messages/frontend.py	87.17% <0.00%> (-0.75%)	⬇️
babel/messages/catalog.py	95.41% <0.00%> (-0.05%)	⬇️

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