Update gz-sensors branch in example

[chapulina]

🦟 Bug fix

• Part of Release Garden gazebo-tooling/release-tools#578

Summary

Now that the gz-sensors7 branch has been created and the main branch has been bumped to version 8 (gazebosim/gz-sensors#254), we should make sure we use the stable branch in the example, otherwise it fails to build.

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)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

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[codecov]

Codecov Report

Merging #1634 (54413ff) into main (d8a3e87) will decrease coverage by 0.01%.
The diff coverage is 61.40%.

❗ Current head 54413ff differs from pull request most recent head cf32cdc. Consider uploading reports for the commit cf32cdc to get more accurate results

@@            Coverage Diff             @@
##             main    #1634      +/-   ##
==========================================
- Coverage   63.57%   63.55%   -0.02%     
==========================================
  Files         330      331       +1     
  Lines       25950    25993      +43     
==========================================
+ Hits        16498    16521      +23     
- Misses       9452     9472      +20     

Impacted Files	Coverage Δ
src/systems/diff_drive/DiffDrive.hh	100.00% <ø> (ø)
...rc/systems/odometry_publisher/OdometryPublisher.hh	100.00% <ø> (ø)
src/systems/sensors/Sensors.cc	63.00% <25.00%> (-0.49%)	⬇️
src/rendering/RenderUtil.cc	38.94% <30.00%> (-0.12%)	⬇️
src/SdfEntityCreator.cc	84.77% <33.33%> (-0.37%)	⬇️
...rc/systems/odometry_publisher/OdometryPublisher.cc	87.87% <89.65%> (-0.55%)	⬇️
include/gz/sim/components/BoundingBoxCamera.hh	100.00% <100.00%> (ø)
src/network/PeerInfo.cc	100.00% <0.00%> (+4.54%)	⬆️

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