oxmc 359bc53e37 api: normalise all signature files to format 4.0 ...

Metalava rejects a mix of format 2.0 and 4.0 files within the same
sdk_library because they have different kotlin-style-nulls settings.
All placeholder files were on 2.0; bump them to match current.txt.

2026-06-15 00:35:36 -07:00

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