[tools] Fix some skylark deprecations

RobotLocomotion / drake

Model-based design and verification for robotics.

https://drake.mit.edu

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Closed jwnimmer-tri closed 6 days ago

jwnimmer-tri commented 1 week ago

In Bazel 8, certain skylark API are deprecated:

Stop using the deprecated to_json method.
Fix gather_transitive_hdrs to use a provider; using a bare struct is deprecated.

Towards #22182.

This change is

jwnimmer-tri commented 1 week ago

+@xuchenhan-tri for ~feature~ both reviews, please.