Revert to previous Metals server version

[tgodzik]

Seems we are getting some errors, which I somehow missed while checking.

Exception in thread "pool-7-thread-2" java.lang.NoSuchMethodError: scala.meta.internal.pc.MetalsGlobal.reporter()Lscala/tools/nsc/reporters/Reporter;
	at scala.meta.internal.pc.ScalaCompilerWrapper.resetReporter(ScalaCompilerAccess.scala:17)
	at scala.meta.internal.pc.CompilerAccess.loadCompiler(CompilerAccess.scala:39)
	at scala.meta.internal.pc.CompilerAccess.withSharedCompiler(CompilerAccess.scala:137)
	at scala.meta.internal.pc.CompilerAccess.$anonfun$withNonInterruptableCompiler$1(CompilerAccess.scala:125)
	at scala.meta.internal.pc.CompilerAccess.$anonfun$onCompilerJobQueue$1(CompilerAccess.scala:197)
	at scala.meta.internal.pc.CompilerJobQueue$Job.run(CompilerJobQueue.scala:103)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)