[Backport 2.x] Bump azure-storage-blob from 12.15.0 to 12.20.0 in /plugins/repository-azure

[tlfeng]

Description

Backport commit 0eb6b2f / PR #4995 to 2.x branch

Bump azure-storage-blob from 12.15.0 to 12.20.0 in /plugins/repository-azure

https://nvd.nist.gov/vuln/detail/CVE-2022-30187

Issues Resolved

n/a

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      2 org.opensearch.backwards.MixedClusterClientYamlTestSuiteIT.test {p0=indices.split/30_copy_settings/Copy settings during split index}

• URL: https://build.ci.opensearch.org/job/gradle-check/13189/
• CommitID: e50a165
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov-commenter]

Codecov Report

Merging #6921 (e50a165) into 2.x (ac79a63) will decrease coverage by 0.04%.
The diff coverage is 31.03%.

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@@             Coverage Diff              @@
##                2.x    #6921      +/-   ##
============================================
- Coverage     70.41%   70.37%   -0.04%     
+ Complexity    59480    59449      -31     
============================================
  Files          4810     4811       +1     
  Lines        285453   285551      +98     
  Branches      41503    41511       +8     
============================================
- Hits         200993   200952      -41     
- Misses        67704    67879     +175     
+ Partials      16756    16720      -36     

Impacted Files	Coverage Δ
...ark/store/remote/filecache/FileCacheBenchmark.java	0.00% <0.00%> (ø)
...pensearch/ingest/useragent/UserAgentProcessor.java	63.41% <ø> (ø)
.../index/reindex/AbstractBaseReindexRestHandler.java	6.66% <ø> (+0.69%)	⬆️
...on/admin/indices/forcemerge/ForceMergeRequest.java	48.71% <0.00%> (-4.06%)	⬇️
...ensearch/index/mapper/ParametrizedFieldMapper.java	98.59% <ø> (ø)
.../java/org/opensearch/index/mapper/TypeParsers.java	81.39% <ø> (ø)
...main/java/org/opensearch/rest/BaseRestHandler.java	69.33% <0.00%> (-7.14%)	⬇️
...rest/action/admin/indices/RestOpenIndexAction.java	34.78% <0.00%> (-22.37%)	⬇️
...va/org/opensearch/index/mapper/MapperTestCase.java	95.33% <ø> (ø)
...g/opensearch/test/rest/OpenSearchRestTestCase.java	3.93% <ø> (ø)
... and 9 more

... and 483 files with indirect coverage changes

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[tlfeng]

Thanks for your review! 👏 @dreamer-89 @reta @owaiskazi19