Add unsigned specification to literals

[Blast545]

Description

As the title says. The performance jobs in the OSRF buildfarm are getting a warning because the indexes used with the iHandle InstanceHandle_t are being forwarded to a template, and the compiler thinks that there may be lost data converting 0 and 15 from int to unsigned int.

Reference failing job: https://build.ros2.org/view/Rci/job/Rci__nightly-performance_ubuntu_noble_amd64/68/gcc/

Silly error, I think this PR should fix it.

I will test this PR in the buildfarm before asking for the PR to be merged.

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• Any new/modified methods have been properly documented using Doxygen.
• Any new configuration API has an equivalent XML API (with the corresponding XSD extension)
• Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• Changes are API compatible.
• New feature has been added to the versions.md file (if applicable).
• New feature has been documented/Current behavior is correctly described in the documentation.
• Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• If this is a critical bug fix, backports to the critical-only supported branches have been requested.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

[JesusPoderoso]

This fix should be present also in 3.x and 2.10.x.
What do you think @MiguelCompany?

[Blast545]

It wasn't straightforward to test this one on our CI, so I went ahead and just tested locally.

I added an extra commit that I was missing: 89b7945

This is the job that we are aiming to get to green: https://build.ros2.org/view/Rci/job/Rci__nightly-performance_ubuntu_noble_amd64/68/

These are the warnings that we want to resolve by merging this PR: https://build.ros2.org/view/Rci/job/Rci__nightly-performance_ubuntu_noble_amd64/68/gcc/

And I'm attaching the output of my local environment for the performance_test repo in case that helps to check if the PR addresses the problem.

ros2_rolling/log/latest_build/performance_test/stdout_stderr.log

Let me know if I can do something else to help merging this, thank you!

[Blast545]

PTAL 🙏

[JesusPoderoso]

Hi @Blast545, thanks for your contribution.
I've opened a new PR with the changes introduced in the PR because our GitHub CI does not work properly with external contributions.
Therefore I am closing this PR.
Thanks!