Update scalameta, semanticdb-scalac, ... to 4.9.9

[scalameta-bot]

About this PR

📦 Updates

• org.scalameta:scalameta
• org.scalameta:semanticdb-scalac
• org.scalameta:semanticdb-scalac-core
• org.scalameta:testkit

from 4.9.6 to 4.9.9

📜 GitHub Release Notes - Version Diff

Usage

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^{labels: library-update, early-semver-patch, semver-spec-patch, version-scheme:semver-spec, commit-count:1}

[tgodzik]

JS version for semanticdb is no longer published, but since we don't use the parser, this should be fine