gh-2522: Bump codecov action to v2

[t92549]

Related Issue

• Resolve Update codecov action #2522

[codecov-commenter]

Codecov Report

Merging #2523 (6513ea2) into develop (7fd5c96) will decrease coverage by 0.49%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #2523      +/-   ##
=============================================
- Coverage      66.92%   66.43%   -0.50%     
  Complexity      2444     2444              
=============================================
  Files            973      938      -35     
  Lines          31909    30421    -1488     
  Branches        3883     3676     -207     
=============================================
- Hits           21355    20209    -1146     
+ Misses          8886     8617     -269     
+ Partials        1668     1595      -73     

Impacted Files	Coverage Δ
...sestore/coprocessor/processor/FilterProcessor.java
...asestore/operation/handler/AddElementsHandler.java
...hq/gaffer/hbasestore/retriever/HBaseRetriever.java
...re/coprocessor/processor/GroupFilterProcessor.java
.../handler/GenerateSplitPointsFromSampleHandler.java
...uk/gov/gchq/gaffer/hbasestore/utils/HBaseUtil.java
...q/gaffer/hbasestore/utils/HBaseStoreConstants.java
...essor/processor/PreAggregationFilterProcessor.java
...ov/gchq/gaffer/hbasestore/SingleUseHBaseStore.java
...r/hbasestore/coprocessor/scanner/StoreScanner.java
... and 25 more

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