Incremented version to 1.2.3.

[dblock]

Coming from opensearch-project/opensearch-build#1365.

[dblock]

@ohltyler Could I have some help with this please?

[ylwu-amzn]

Test "org.opensearch.ad.e2e.DetectionResultEvalutationIT.testDataset" is flaky, we need to fix this. Rerun CI to check if it can pass.

Run ./gradlew build successfully on desktop. But second run shows
Rule violated for class org.opensearch.ad.task.ADTaskManager: lines covered ratio is 0.74, but expected minimum is 0.75
Seems some test didn't run.

Track these in #278 and rerun CI

[codecov-commenter]

Codecov Report

Merging #345 (36344cc) into 1.2 (6109a12) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                1.2     #345      +/-   ##
============================================
- Coverage     76.37%   76.27%   -0.10%     
+ Complexity     3971     3966       -5     
============================================
  Files           295      295              
  Lines         17180    17180              
  Branches       1812     1812              
============================================
- Hits          13121    13104      -17     
- Misses         3236     3252      +16     
- Partials        823      824       +1     

Flag	Coverage Δ
plugin	76.27% <ø> (-0.10%)	⬇️

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

Impacted Files	Coverage Δ
.../opensearch/ad/transport/StopDetectorResponse.java	19.04% <0.00%> (-23.81%)	⬇️
...port/SearchAnomalyDetectorInfoTransportAction.java	60.00% <0.00%> (-4.45%)	⬇️
...ansport/handler/AnomalyResultBulkIndexHandler.java	67.74% <0.00%> (-3.23%)	⬇️
.../java/org/opensearch/ad/caching/PriorityCache.java	69.69% <0.00%> (-0.56%)	⬇️
...ain/java/org/opensearch/ad/task/ADTaskManager.java	76.37% <0.00%> (-0.53%)	⬇️
...java/org/opensearch/ad/task/ADBatchTaskRunner.java	81.76% <0.00%> (ø)
...opensearch/ad/indices/AnomalyDetectionIndices.java	68.53% <0.00%> (+0.18%)	⬆️