Update CLA document link

[sfc-gh-stan]

Please answer these questions before submitting your pull requests. Thanks!

1. What GitHub issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes #NNNN

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
   • I am adding new logging messages
   • I am adding new credentials
   • I am adding a new dependency

3. Please describe how your code solves the related issue.

   CLA document is moved to a new repo, we need to update the link. This should be automated in the future.

[codecov]

Codecov Report

Merging #422 (4616506) into main (a72fa39) will increase coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 4616506 differs from pull request most recent head a204e5d. Consider uploading reports for the commit a204e5d to get more accurate results

@@            Coverage Diff             @@
##             main     #422      +/-   ##
==========================================
+ Coverage   81.26%   81.29%   +0.03%     
==========================================
  Files          10       10              
  Lines        1281     1278       -3     
  Branches      192      192              
==========================================
- Hits         1041     1039       -2     
+ Misses        178      176       -2     
- Partials       62       63       +1     

see 1 file with indirect coverage changes

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