chore(deps): bump libloading from 0.8.9 to 0.9.0

[dependabot]

Bumps libloading from 0.8.9 to 0.9.0.

Commits

• dab97c5 0.9.0 release rites
• e893804 refactor: simplify null checks, remove some iffy implementations
• 4b98285 add no-std support
• See full diff in compare view

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[vyncint]

Holding this until after 2.3.0 ships, deliberately.

The release is being cut now, and each of these four changes a dependency that this repository cannot fully exercise on a plain runner:

• sha2 0.10 → 0.11 feeds the candidate-id hash that appears in plan.v1, results.v1 and the committed fixtures. CI is green, which is real evidence the ids did not move — but that is worth landing on its own, after a release rather than inside one.
• metal 0.29 → 0.33 is the Apple Silicon measurement backend. This PR's CI predates the Metal smoke step that test: cover the part that decides what the number is #94 added, so green here means it compiles, not that it dispatches. Rebasing it onto main will run a real dispatch on macos-latest and that is the check it needs.
• jsonschema 0.26 → 0.56 and libloading 0.8 → 0.9 are red. libloading is the CUDA dlopen path, which nothing on a plain runner executes at all.

None of this is a judgement on the bumps. They land after the release, with the checks that can actually speak to them.