[doc] Add 0.34.1 cherries to changelog

[villebro]

CATEGORY

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• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

Add cherries in 0.34.1 to changelog.

REVIEWERS

@mistercrunch @michellethomas

[codecov-io]

Codecov Report

Merging #8376 into master will increase coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8376      +/-   ##
==========================================
+ Coverage   67.42%   67.57%   +0.15%     
==========================================
  Files         448      448              
  Lines       22527    22527              
  Branches     2364     2364              
==========================================
+ Hits        15188    15222      +34     
+ Misses       7201     7167      -34     
  Partials      138      138

Impacted Files	Coverage Δ
superset/views/core.py	70.15% <0%> (+0.2%)	⬆️
superset/models/core.py	81.93% <0%> (+0.63%)	⬆️
superset/dataframe.py	94.48% <0%> (+1.57%)	⬆️
superset/db_engine_specs/mysql.py	92.15% <0%> (+49.01%)	⬆️

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