Link to sdformat10 cmake target

[scpeters]

🦟 Bug fix

Needed by gazebosim/sdformat#780

Summary

This links to the proper cmake target for sdformat, which is better than using the SDFormat_LIBRARIES variable. That variable may be removed in gazebosim/sdformat#780, so it's good to make this change now.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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[codecov]

Codecov Report

Merging #314 (c4a2874) into ign-physics3 (fa93f17) will not change coverage.
The diff coverage is n/a.

❗ Current head c4a2874 differs from pull request most recent head 0a6fac3. Consider uploading reports for the commit 0a6fac3 to get more accurate results

@@              Coverage Diff              @@
##           ign-physics3     #314   +/-   ##
=============================================
  Coverage         74.66%   74.66%           
=============================================
  Files               117      117           
  Lines              4906     4906           
=============================================
  Hits               3663     3663           
  Misses             1243     1243           

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[osrf-triage]

This pull request has been mentioned on Gazebo Community. There might be relevant details there:

https://community.gazebosim.org/t/new-ignition-releases-2022-01-10/1228/1