Update scalameta, semanticdb-scalac-core, ... to 4.8.0

[scala-center-steward]

About this PR

📦 Updates

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

from 4.7.8 to 4.8.0

📜 GitHub Release Notes - Version Diff

Usage

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

[bjaglin]

Putting this on hold until the implications of the minor bump are well understood & scalameta/scalameta#3210 is investigated

[bjaglin]

#1809