Fix: AWS Go SDK URL

[schen1]

Please add a summary of your change

Fixes the dead link from the Velero docs

• AWS Go SDK v1 for releases until v1.13
• AWS Go SDK v2 for releases v1.14 and v.15

Does your change fix a particular issue?

No

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file (make new-changelog) or comment /kind changelog-not-required on this PR.
• Updated the corresponding documentation in site/content/docs/main.

[schen1]

/kind changelog-not-required

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.02%. Comparing base (04d6c79) to head (4f634dc).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8489   +/-   ##
=======================================
  Coverage   59.02%   59.02%           
=======================================
  Files         369      369           
  Lines       39056    39056           
=======================================
  Hits        23052    23052           
  Misses      14542    14542           
  Partials     1462     1462           

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