Adds project-level dependency exclusions:
excludeDependencies += "org.apache.logging.log4j"
excludeDependencies += "com.example" %% "foo"
In the first example, all artifacts from the organization
`"org.apache.logging.log4j"` are excluded from the managed dependency.
In the second example, artifacts with the organization `"com.example"`
and the name `"foo"` cross versioned to the current `scalaVersion` are
excluded.