Update sbt-bloop to 1.5.15

[scala-steward]

About this PR

📦 Updates ch.epfl.scala:sbt-bloop from 1.4.6-21-464e4ec4 to 1.5.15

📜 GitHub Release Notes

Usage

✅ Please merge!

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

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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 = "ch.epfl.scala", artifactId = "sbt-bloop" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "30 days" }, dependency = { groupId = "ch.epfl.scala", artifactId = "sbt-bloop" } }] ```

^{labels: sbt-plugin-update, early-semver-minor, semver-spec-minor, commit-count:1}

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (4bb7259) 68.78% compared to head (b9c37e4) 68.78%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #313 +/- ## ======================================= Coverage 68.78% 68.78% ======================================= Files 96 96 Lines 1419 1419 Branches 75 75 ======================================= Hits 976 976 Misses 443 443 ```

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[scala-steward]

Superseded by #321.