Change google_cloud_bigdataoss_version to 2.2.8.

[scwhittle]

Fixes #21492

This release includes GoogleCloudDataproc/hadoop-connectors#865 which fixes google/conscrypt#864 .

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[codecov]

Codecov Report

Merging #23300 (d01e658) into master (d578e3d) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #23300      +/-   ##
==========================================
- Coverage   73.43%   73.41%   -0.02%     
==========================================
  Files         718      718              
  Lines       95620    95620              
==========================================
- Hits        70214    70201      -13     
- Misses      24095    24108      +13     
  Partials     1311     1311              

Flag	Coverage Δ
python	83.18% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
sdks/python/apache_beam/utils/interactive_utils.py	95.12% <0.00%> (-2.44%)	⬇️
...ks/python/apache_beam/runners/worker/data_plane.py	87.57% <0.00%> (-1.70%)	⬇️
.../python/apache_beam/transforms/periodicsequence.py	98.38% <0.00%> (-1.62%)	⬇️
...eam/runners/portability/fn_api_runner/execution.py	92.44% <0.00%> (-0.65%)	⬇️
...eam/runners/interactive/interactive_environment.py	91.71% <0.00%> (-0.31%)	⬇️
...ks/python/apache_beam/runners/worker/sdk_worker.py	88.94% <0.00%> (-0.16%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.54% <0.00%> (-0.13%)	⬇️
sdks/python/apache_beam/runners/direct/executor.py	97.01% <0.00%> (+0.54%)	⬆️

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[scwhittle]

Closing/reopening to retrigger checks since failures seemed unrelated

[Abacn]

Run Java PreCommit

[scwhittle]

Run Java PreCommit

[scwhittle]

@Abacn Tests are green now (unrelated flakes)

[Abacn]

Thanks, LGTM

[github-actions]

R: @damccorm for final approval

[cnauroth]

LGTM. I just wanted to mention that since you're upgrading from 2.2.6 to 2.2.8, then you're also picking up a nice fix from 2.2.7 for a bug that could have impacted users that override the default trust store:

GoogleCloudDataproc/hadoop-connectors#786