docs: link fix in CONTRIBUTING.md

[a5net]

SUMMARY

Replaces outdated link with the new one.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue: Wrong redirect link in CONTRIBUTING.md #12717
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-io]

Codecov Report

Merging #12718 (84e7fd8) into master (9e58eb8) will decrease coverage by 0.83%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12718      +/-   ##
==========================================
- Coverage   66.73%   65.89%   -0.84%     
==========================================
  Files        1021     1021              
  Lines       49967    49967              
  Branches     4890     4890              
==========================================
- Hits        33347    32928     -419     
- Misses      16491    16886     +395     
- Partials      129      153      +24     

Flag	Coverage Δ
cypress	45.50% <ø> (-5.01%)	⬇️
javascript	60.91% <ø> (ø)
python	63.66% <ø> (-0.33%)	⬇️

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

Impacted Files	Coverage Δ
...t-frontend/src/dashboard/containers/SliceAdder.jsx	0.00% <0.00%> (-100.00%)	⬇️
...rontend/src/dashboard/components/dnd/handleDrop.js	0.00% <0.00%> (-96.16%)	⬇️
...ontend/src/dashboard/components/dnd/handleHover.js	12.50% <0.00%> (-87.50%)	⬇️
superset/db_engines/hive.py	0.00% <0.00%> (-85.72%)	⬇️
...rc/dashboard/components/dnd/dragDroppableConfig.js	29.16% <0.00%> (-70.84%)	⬇️
...c/dashboard/components/dnd/AddSliceDragPreview.jsx	35.71% <0.00%> (-64.29%)	⬇️
...ontend/src/dashboard/util/serializeFilterScopes.js	40.00% <0.00%> (-60.00%)	⬇️
...et-frontend/src/dashboard/actions/sliceEntities.js	12.90% <0.00%> (-58.07%)	⬇️
...frontend/src/dashboard/components/AddSliceCard.jsx	50.00% <0.00%> (-50.00%)	⬇️
...rc/explore/components/controls/ColorMapControl.jsx	36.36% <0.00%> (-45.46%)	⬇️
... and 46 more

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