Upgrade log4j to 2.16.0 for CVE-2021-45046

[npawar]

Upgrade log4j to 2.16.0 for CVE-2021-45046

[codecov-commenter]

Codecov Report

Merging #7903 (cd19abb) into master (9127286) will increase coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #7903      +/-   ##
============================================
+ Coverage     71.25%   71.32%   +0.06%     
- Complexity     4087     4092       +5     
============================================
  Files          1589     1589              
  Lines         82131    82131              
  Branches      12271    12271              
============================================
+ Hits          58520    58577      +57     
+ Misses        19643    19587      -56     
+ Partials       3968     3967       -1     

Flag	Coverage Δ
integration1	29.18% <ø> (+<0.01%)	⬆️
integration2	27.69% <ø> (+<0.01%)	⬆️
unittests1	68.37% <ø> (+0.04%)	⬆️
unittests2	14.38% <ø> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...ller/helix/core/minion/TaskTypeMetricsUpdater.java	80.00% <0.00%> (-20.00%)	⬇️
...nction/DistinctCountBitmapAggregationFunction.java	47.15% <0.00%> (-9.85%)	⬇️
.../java/org/apache/pinot/spi/data/TimeFieldSpec.java	88.63% <0.00%> (-2.28%)	⬇️
...lix/core/realtime/PinotRealtimeSegmentManager.java	81.67% <0.00%> (-2.10%)	⬇️
...ata/manager/realtime/RealtimeTableDataManager.java	67.88% <0.00%> (-0.82%)	⬇️
.../controller/helix/core/SegmentDeletionManager.java	75.60% <0.00%> (-0.82%)	⬇️
...ache/pinot/common/metadata/ZKMetadataProvider.java	81.95% <0.00%> (-0.76%)	⬇️
.../aggregation/function/ModeAggregationFunction.java	88.37% <0.00%> (-0.28%)	⬇️
...ntroller/helix/core/PinotHelixResourceManager.java	64.34% <0.00%> (-0.08%)	⬇️
.../helix/core/realtime/SegmentCompletionManager.java	72.00% <0.00%> (+0.20%)	⬆️
... and 14 more

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