remove sbt-whitesource

https://github.com/sbt/io/runs/4202057027#step:6:479

```
[error] Error communicating with service: Illegal arguments: Bad org token
[error] sbtwhitesource.WhiteSourceException: Error communicating with service: Illegal arguments: Bad org token
[error] 	at sbtwhitesource.CheckPoliciesAction.sendCheckPolicies(WhiteSource.scala:382)
[error] 	at sbtwhitesource.CheckPoliciesAction.doExecute(WhiteSource.scala:364)
[error] 	at sbtwhitesource.BaseAction.execute(WhiteSource.scala:68)
```

.github/workflows/ci.yml

@@ -45,7 +45,7 @@ jobs:
  run: |
  case ${{ matrix.jobtype }} in
  1)
- sbt -v -Dfile.encoding=UTF8 -Dsbt.test.fork=true ++$SCALA212! mimaReportBinaryIssues scalafmtCheckAll headerCheck Test/headerCheck test whitesourceCheckPolicies doc
+ sbt -v -Dfile.encoding=UTF8 -Dsbt.test.fork=true ++$SCALA212! mimaReportBinaryIssues scalafmtCheckAll headerCheck Test/headerCheck test doc
  sbt -v -Dfile.encoding=UTF8 -Dsbt.test.fork=false ++$SCALA213! test
  ;;
  2)

build.sbt

@@ -161,14 +161,3 @@ val io = (project in file("io"))
  Test / buildInfoPackage := "sbt.internal.io",
  Test / buildInfoUsePackageAsPath := true,
  )
-
-inThisBuild(
- Seq(
- whitesourceProduct := "Lightbend Reactive Platform",
- whitesourceAggregateProjectName := "sbt-io-master",
- whitesourceAggregateProjectToken := "460d23766d364910a7c6f8f330f55aea651a3d13b4a94809b79bb6fb63c761ea",
- whitesourceIgnoredScopes += "scalafmt",
- whitesourceFailOnError := sys.env.contains("WHITESOURCE_PASSWORD"), // fail if pwd is present
- whitesourceForceCheckAllDependencies := true,
- )
-)

project/plugins.sbt

@@ -4,5 +4,4 @@ addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "0.8.1")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.2.0")
 addSbtPlugin("org.scala-sbt" % "sbt-contraband" % "0.5.1")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.9.0")
-addSbtPlugin("com.lightbend" % "sbt-whitesource" % "0.1.14")
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.1.0")