Update protobuf-java to 3.15.8

[scala-steward]

About this PR

📦 Updates com.google.protobuf:protobuf-java from 3.15.6 to 3.15.8

📜 GitHub Release Notes - Version Diff

Usage

✅ Please merge!

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⚙ Adjust future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "com.google.protobuf", artifactId = "protobuf-java" } ]

Or, add this to slow down future updates of this dependency:

dependencyOverrides = [{
  pullRequests = { frequency = "30 days" },
  dependency = { groupId = "com.google.protobuf", artifactId = "protobuf-java" }
}]

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

[mergify]

⚠️ The sha of the head commit of this PR conflicts with #2176. Mergify cannot evaluate rules on this PR. ⚠️