Update plugin metro to v0.9.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
dev.zacsweers.metro	0.9.3 → 0.9.4

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Release Notes

ZacSweers/metro (dev.zacsweers.metro)

v0.9.4

Compare Source

2026-01-09

Enhancements

• [IR] Support generation of scalar multibinding sets that use @ElementsIntoSet source bindings. Previously these would always use a SetFactory under the hood.
• [IR] Refactor multibinding getter logic to align with all other binding field/getter logic, allowing more precise generation of multibindings based on different contextual needs (scalar, Provider, etc representations).

Fixes

• [IR] Fix accidental potential for runtime eager calls to non-initialized bindings in some multi-level multibinding scenarios.
• [IR] Always use a provider field if multiple provider and scalar refs are found. Previously we would possibly use just a scalar getter field wrapped in InstanceFactory for provider refs.
• [IR / Dagger Interop] Ensure @BindsOptionalOf bindings that are satisfied by scoped bindings use the scoped instance.
• [IR / Reports] Don't de-dupe alias/memberinject bindings in graph metadata reports if one is already present.

Changes

• Remove -checkdiscard rules from embedded proguard rules.

Contributors

Special thanks to the following contributors for contributing to this release!

• @​C2H6O
• @​chrisbanes

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