Rollback dill.

[tvalentyn]

Some tests failed internally with this upgrade and there is a risk that users may be broken. Let's roll back given that we are cutting a release today, out of caution.

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[tvalentyn]

R: @pabloem @ryanthompson591

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[codecov]

Codecov Report

Merging #21898 (4c6b6fb) into master (6bffe84) will increase coverage by 0.26%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #21898      +/-   ##
==========================================
+ Coverage   74.01%   74.27%   +0.26%     
==========================================
  Files         699      701       +2     
  Lines       92675    93938    +1263     
==========================================
+ Hits        68589    69773    +1184     
- Misses      22831    22910      +79     
  Partials     1255     1255              

Flag	Coverage Δ
python	83.84% <100.00%> (+0.19%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...hon/apache_beam/runners/dataflow/internal/names.py	100.00% <100.00%> (ø)
sdks/python/apache_beam/runners/direct/executor.py	96.46% <0.00%> (-0.55%)	⬇️
...examples/inference/sklearn_mnist_classification.py	47.50% <0.00%> (ø)
...m/examples/inference/pytorch_image_segmentation.py	0.00% <0.00%> (ø)
sdks/python/apache_beam/runners/common.py	88.80% <0.00%> (+0.12%)	⬆️
sdks/python/apache_beam/coders/coders.py	88.34% <0.00%> (+0.12%)	⬆️
sdks/python/apache_beam/io/avroio.py	98.30% <0.00%> (+0.28%)	⬆️
...hon/apache_beam/runners/worker/bundle_processor.py	93.67% <0.00%> (+0.37%)	⬆️
sdks/python/apache_beam/io/filebasedsource.py	99.21% <0.00%> (+0.42%)	⬆️
sdks/python/apache_beam/io/textio.py	97.97% <0.00%> (+1.07%)	⬆️
... and 7 more

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[Abacn]

Should CHANGES.md also need rollback the line that announces the upgrade?

[pabloem]

yes @Abacn we would need to make sure this is not passed in CHANGES.md - I will manually remove this from the release nmotes for now

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