[Backport 2.x] Increment version to 2.4.0.0

[opensearch-trigger-bot]

Backport fd53d1d from #2084

[codecov-commenter]

Codecov Report

Merging #2088 (fd53d1d) into 2.x (1d32fb1) will increase coverage by 0.04%.
The diff coverage is 66.66%.

❗ Current head fd53d1d differs from pull request most recent head d632fd5. Consider uploading reports for the commit d632fd5 to get more accurate results

@@             Coverage Diff              @@
##                2.x    #2088      +/-   ##
============================================
+ Coverage     61.00%   61.04%   +0.04%     
- Complexity     3226     3229       +3     
============================================
  Files           256      256              
  Lines         18075    18075              
  Branches       3225     3225              
============================================
+ Hits          11026    11034       +8     
+ Misses         5471     5465       -6     
+ Partials       1578     1576       -2     

Impacted Files	Coverage Δ
...security/configuration/DlsFlsFilterLeafReader.java	61.98% <ø> (ø)
...rch/security/dlic/rest/api/WhitelistApiAction.java	100.00% <ø> (ø)
...ch/security/securityconf/DynamicConfigFactory.java	56.05% <ø> (ø)
...rg/opensearch/security/ssl/util/CertFileProps.java	100.00% <ø> (ø)
...org/opensearch/security/ssl/util/CertFromFile.java	100.00% <ø> (ø)
...opensearch/security/ssl/util/CertFromKeystore.java	73.91% <ø> (ø)
...ensearch/security/ssl/util/CertFromTruststore.java	87.87% <ø> (ø)
...search/security/ssl/util/CertificateValidator.java	69.41% <ø> (ø)
...rg/opensearch/security/ssl/util/KeystoreProps.java	72.72% <ø> (ø)
...a/org/opensearch/security/tools/SecurityAdmin.java	35.75% <16.66%> (-0.25%)	⬇️
... and 20 more

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