ci: update 'redis' and 'deadpool-redis' in the same dependabot's group

[woshilapin]

Should help avoiding this kind of automatic update and this fix. It will not block them, but at least, the PR will be shown as a group so let's hope it's a good remainder to the maintainer who will take a look 🤷

Maybe a better solution can come up at some point, we'll see 🤷

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.93%. Comparing base (cbee100) to head (862a85b).
Report is 35 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10802      +/-   ##
==========================================
+ Coverage   81.87%   81.93%   +0.06%     
==========================================
  Files        1082     1083       +1     
  Lines      107150   107554     +404     
  Branches      721      741      +20     
==========================================
+ Hits        87725    88123     +398     
- Misses      19384    19390       +6     
  Partials       41       41              

Flag	Coverage Δ
editoast	74.31% <ø> (-0.01%)	⬇️
front	89.46% <ø> (+0.05%)	⬆️
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.50% <ø> (ø)
tests	87.91% <ø> (ø)

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[flomonster]

Great idea