Update sensors with pending trigger immediately in Sensors system

[shameekganguly]

🦟 Bug fix

Fixes https://github.com/gazebosim/gz-sensors/issues/426

Summary

Update Sensors system to ignore update rate for sensors that have pending triggers and update them immediately. Depends on upstream https://github.com/gazebosim/gz-sensors/pull/431.

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.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 65.92%. Comparing base (922eea7) to head (d8d351d). Report is 168 commits behind head on gz-sim8.

Files	Patch %	Lines
src/systems/sensors/Sensors.cc	85.71%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## gz-sim8 #2408 +/- ## =========================================== + Coverage 64.88% 65.92% +1.03% =========================================== Files 360 327 -33 Lines 29448 31328 +1880 =========================================== + Hits 19108 20653 +1545 - Misses 10340 10675 +335 ```

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