fix: downgrade to spark3.1

[serena-ruan]

Related Issues/PRs

#xxx

What changes are proposed in this pull request?

Briefly describe the changes included in this Pull Request.

How is this patch tested?

• [ ] I have written tests (not required for typo or doc fix) and confirmed the proposed feature/bug-fix/change works.

Does this PR change any dependencies?

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• [ ] Yes. Make sure the dependencies are resolved correctly, and list changes here.

Does this PR add a new feature? If so, have you added samples on website?

• [ ] No. You can skip this section.
• [ ] Yes. Make sure you have added samples following below steps.

1. Find the corresponding markdown file for your new feature in website/docs/documentation folder. Make sure you choose the correct class estimators/transformers and namespace.
2. Follow the pattern in markdown file and add another section for your new API, including pyspark, scala (and .NET potentially) samples.
3. Make sure the DocTable points to correct API link.
4. Navigate to website folder, and run yarn run start to make sure the website renders correctly.
5. Don't forget to add <!--pytest-codeblocks:cont--> before each python code blocks to enable auto-tests for python samples.
6. Make sure the WebsiteSamplesTests job pass in the pipeline.

[github-actions[bot]]

Hey @serena-ruan :wave:! Thank you so much for contributing to our repository :raised_hands:. Someone from SynapseML Team will be reviewing this pull request soon. We appreciate your patience and contributions :100:!

[serena-ruan]

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[codecov-commenter]

Codecov Report

Merging #1646 (073f03b) into spark3.1 (7abf839) will decrease coverage by 16.22%. The diff coverage is n/a.

@@              Coverage Diff              @@
##           spark3.1    #1646       +/-   ##
=============================================
- Coverage     85.83%   69.61%   -16.23%     
=============================================
  Files           272      272               
  Lines         14230    14230               
  Branches        767      767               
=============================================
- Hits          12215     9906     -2309     
- Misses         2015     4324     +2309     

Impacted Files	Coverage Δ
.../execution/streaming/continuous/HTTPSourceV2.scala	0.00% <0.00%> (-92.09%)	:arrow_down:
...che/spark/sql/execution/streaming/HTTPSource.scala	0.00% <0.00%> (-90.00%)	:arrow_down:
...ql/execution/streaming/continuous/HTTPSinkV2.scala	0.00% <0.00%> (-89.75%)	:arrow_down:
...soft/azure/synapse/ml/cognitive/AudioStreams.scala	0.00% <0.00%> (-87.88%)	:arrow_down:
...ft/azure/synapse/ml/cognitive/AzureSearchAPI.scala	2.59% <0.00%> (-87.02%)	:arrow_down:
...osoft/azure/synapse/ml/cognitive/AzureSearch.scala	7.19% <0.00%> (-80.58%)	:arrow_down:
...rosoft/azure/synapse/ml/geospatial/Geocoders.scala	15.21% <0.00%> (-80.44%)	:arrow_down:
...re/synapse/ml/geospatial/CheckPointInPolygon.scala	15.00% <0.00%> (-80.00%)	:arrow_down:
...ql/execution/streaming/DistributedHTTPSource.scala	0.00% <0.00%> (-78.34%)	:arrow_down:
...se/ml/cognitive/MultivariateAnomalyDetection.scala	11.29% <0.00%> (-77.42%)	:arrow_down:
... and 45 more

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[serena-ruan]

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[serena-ruan]

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[serena-ruan]

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[serena-ruan]

/azp run

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[serena-ruan]

/azp run

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