Bump rendering, sensors and gui dependencies to 8

[iche033]

Bumped to use new Harmonic dependencies

gazebo-tooling/release-tools#853

marked draft while we wait for gui8 and sensors8 nightly debs to be ready
Update: Builds are working. Ready for review

[codecov]

Codecov Report

Merging #1837 (c3d79e2) into main (5fe83a3) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1837      +/-   ##
==========================================
- Coverage   64.49%   64.46%   -0.03%     
==========================================
  Files         341      341              
  Lines       27098    27098              
==========================================
- Hits        17477    17469       -8     
- Misses       9621     9629       +8     

Impacted Files	Coverage Δ
src/rendering/RenderUtil.cc	39.56% <ø> (ø)
src/systems/thruster/Thruster.cc	85.78% <0.00%> (-4.07%)	⬇️

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[iche033]

@osrf-jenkins run tests please

[iche033]

This PR is ready. Not sure why the jenksins build statuses are not updating but the latest CI builds are working with unrelated test failures:

https://build.osrfoundation.org/job/ign_gazebo-pr-win/5362 - 2 tests failure.
https://build.osrfoundation.org/job/ignition_gazebo-ci-pr_any-homebrew-amd64/9627/ - green
https://build.osrfoundation.org/job/ignition_gazebo-ci-pr_any-ubuntu_auto-amd64/10021/ - 1 test failure