🦟 Bug fix

Try to fix compiler warnings on jammy

Summary

Add pkg-config to CI package list to see if that helps to find urdfdom.

There are several compiler warnings due to using the internal vendored copy of urdfdom since it fails to find the external copy of urdfdom. I'm guessing that it's failing due to missing pkg-config, so this is a test that addes pkg-config to packages.apt.

https://build.osrfoundation.org/job/sdformat-ci-sdf12-jammy-amd64/4/

-- Looking for urdfdom - not found
-- Looking for IgnURDFDOM - not found
-- Using internal URDF

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
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