Update the tasty inspector returned value

[BarkingBad]

Release notes template

Now TastyInspector.{inspectTastyFiles, inspectTastyFilesInJar, inspectAllTastyFiles} return a boolean value indicating whether the process succeeded

[dwijnand]

[info] Test dotty.tools.dotc.BootstrappedStdLibTASYyTest.testTastyInspector started
Error:  Test dotty.tools.dotc.BootstrappedStdLibTASYyTest.testTastyInspector failed: java.lang.AssertionError: assertion failed: Errors reported while loading from TASTy, took 5.787 sec
Error:      at scala.runtime.Scala3RunTime$.assertFailed(Scala3RunTime.scala:8)
Error:      at dotty.tools.dotc.BootstrappedStdLibTASYyTest$.loadWithTastyInspector(BootstrappedStdLibTASYyTest.scala:113)
Error:      at dotty.tools.dotc.BootstrappedStdLibTASYyTest.testTastyInspector(BootstrappedStdLibTASYyTest.scala:22)
Error:      at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Error:      at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
Error:      at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
Error:      at java.lang.reflect.Method.invoke(Method.java:567)
Error:      ...