oakpal checks should no longer be performed for AEM 6.3

[joerghoh]

We dropped support for AEM 6.3, so oakpal does not longer need to perform checks for it.

[codecov]

Codecov Report

Merging #2670 (4e1c097) into master (ccf11ec) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #2670   +/-   ##
=========================================
  Coverage     52.52%   52.52%           
  Complexity     5300     5300           
=========================================
  Files           751      751           
  Lines         30059    30059           
  Branches       3880     3880           
=========================================
  Hits          15789    15789           
  Misses        12804    12804           
  Partials       1466     1466           

Impacted Files	Coverage Δ
...be/acs/commons/oakpal/checks/ImportedPackages.java	95.80% <100.00%> (ø)

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