Tweak merge strategy

This resolves the following `assembly` error:

```
[error] 1 error was encountered during merge
[error] java.lang.RuntimeException: deduplicate: different file contents found in the following:
[error] /home/runner/.cache/coursier/v1/https/repo1.maven.org/maven2/com/squareup/okio/okio-jvm/3.2.0/okio-jvm-3.2.0.jar:META-INF/okio.kotlin_module
[error] /home/runner/.cache/coursier/v1/https/repo1.maven.org/maven2/com/squareup/okio/okio/3.2.0/okio-3.2.0.jar:META-INF/okio.kotlin_module
[error]   at sbtassembly.Assembly$.applyStrategies(Assembly.scala:161)
[error]   at sbtassembly.Assembly$.x$1$lzycompute$1(Assembly.scala:43)
[error]   at sbtassembly.Assembly$.x$1$1(Assembly.scala:41)
[error]   at sbtassembly.Assembly$.stratMapping$lzycompute$1(Assembly.scala:41)
[error]   at sbtassembly.Assembly$.stratMapping$1(Assembly.scala:41)
[error]   at sbtassembly.Assembly$.inputs$lzycompute$1(Assembly.scala:86)
[error]   at sbtassembly.Assembly$.inputs$1(Assembly.scala:76)
[error]   at sbtassembly.Assembly$.apply(Assembly.scala:103)
[error]   at sbtassembly.Assembly$.$anonfun$assemblyTask$1(Assembly.scala:278)
[error]   at scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error]   at sbt.internal.util.$tilde$greater.$anonfun$$u2219$1(TypeFunctions.scala:63)
[error]   at sbt.std.Transform$$anon$4.work(Transform.scala:69)
[error]   at sbt.Execute.$anonfun$submit$2(Execute.scala:283)
[error]   at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:24)
[error]   at sbt.Execute.work(Execute.scala:292)
[error]   at sbt.Execute.$anonfun$submit$1(Execute.scala:283)
[error]   at sbt.ConcurrentRestrictions$$anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)
[error]   at sbt.CompletionService$$anon$2.call(CompletionService.scala:65)
[error]   at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error]   at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
[error]   at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[error]   at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[error]   at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[error]   at java.base/java.lang.Thread.run(Thread.java:829)
[error] (assembly) deduplicate: different file contents found in the following:
[error] /home/runner/.cache/coursier/v1/https/repo1.maven.org/maven2/com/squareup/okio/okio-jvm/3.2.0/okio-jvm-3.2.0.jar:META-INF/okio.kotlin_module
[error] /home/runner/.cache/coursier/v1/https/repo1.maven.org/maven2/com/squareup/okio/okio/3.2.0/okio-3.2.0.jar:META-INF/okio.kotlin_module
[error] Total time: 2 s, completed Jul 5, 2023, 5:59:37 PM
```

build.sbt

@@ -25,6 +25,7 @@ libraryDependencies ++= Seq(
 )
 
 assembly / assemblyMergeStrategy := {
+  case PathList("META-INF", _*) => MergeStrategy.discard
   case x if x.endsWith("module-info.class") => MergeStrategy.first
   case y =>
     val oldStrategy = (assembly / assemblyMergeStrategy).value