[jvm-packages] add the missing scm urls

[CodingCat]

for some reason this part was missing in master branch????

[codecov-io]

Codecov Report

Merging #3589 into master will increase coverage by 0.09%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3589      +/-   ##
============================================
+ Coverage     50.04%   50.14%   +0.09%     
  Complexity      188      188              
============================================
  Files           172      172              
  Lines         13877    13877              
  Branches        457      457              
============================================
+ Hits           6945     6958      +13     
+ Misses         6707     6694      -13     
  Partials        225      225

Impacted Files	Coverage Δ	Complexity Δ
src/data/sparse_page_dmatrix.cc	92.89% <0%> (+0.59%)	0% <0%> (ø)	⬇️
src/data/sparse_page_raw_format.cc	64.15% <0%> (+22.64%)	0% <0%> (ø)	⬇️

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