Manually migrate assimp to 5.4.3

[traversaro]

To unblock https://github.com/conda-forge/gz-sim-feedstock/pull/64 . The automatic bot migration is blocked by https://github.com/conda-forge/dartsim-feedstock/issues/97 .

Checklist

• [x] Used a personal fork of the feedstock to propose changes
• [x] Bumped the build number (if the version is unchanged)
• [ ] Reset the build number to 0 (if the version changed)
• [x] Re-rendered with the latest conda-smithy (Use the phrase code>@<space/conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• [x] Ensured the license file is being packaged.

[traversaro]

@conda-forge-admin, please rerender

[traversaro]

fyi @jslee02

[github-actions[bot]]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

[github-actions[bot]]

Hi! This is the friendly conda-forge automerge bot!

I considered the following status checks when analyzing this PR:

• linter: passed
• azure: passed

Thus the PR was passing and merged! Have a great day!