Update snakeyaml to version 2.0

[rishabhmaurya]

Snakeyaml released the version 2.0 which also addresses the GHSA-mjmj-j48q-9wg2.

Description of changes:
Similar to opensearch-project/OpenSearch#5576
CheckList:

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[getsaurabh02]

Should we raise this PR against 1.x and backport to 1.3 instead?

[codecov]

Codecov Report

Merging #818 (02810de) into 1.3 (f9e9c6b) will decrease coverage by 0.36%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                1.3     #818      +/-   ##
============================================
- Coverage     77.00%   76.65%   -0.36%     
+ Complexity     2084     2070      -14     
============================================
  Files           254      254              
  Lines         11770    11770              
  Branches       1830     1830              
============================================
- Hits           9064     9022      -42     
- Misses         1691     1755      +64     
+ Partials       1015      993      -22     

see 13 files with indirect coverage changes

[rishabhmaurya]

The failure can be ignored as it seem to be flaky test. There was an effort to fix this flaky test in 2.x and its backport to 1.x failed earlier -
#542

Assertion failure -

Suite: Test class org.opensearch.indexmanagement.transform.TransformRunnerIT
  2> REPRODUCE WITH: ./gradlew ':integTest' --tests "org.opensearch.indexmanagement.transform.TransformRunnerIT.test continuous transform with wildcard indices" -Dtests.seed=566DD28B92044ABE -Dtests.security.manager=false -Dtests.locale=de-CH -Dtests.timezone=Asia/Beirut -Druntime.java=8
  2> java.lang.AssertionError: Not the expected pages processed expected:<6> but was:<2>
        at __randomizedtesting.SeedInfo.seed([566DD28B92044ABE:BC0B1C1C27D4D359]:0)
        at org.junit.Assert.fail(Assert.java:89)
        at org.junit.Assert.failNotEquals(Assert.java:835)
        at org.junit.Assert.assertEquals(Assert.java:647)
        at org.opensearch.indexmanagement.transform.TransformRunnerIT.test continuous transform with wildcard indices(TransformRunnerIT.kt:743)