git: openjdk/loom: fibers: Replace RUNNING/NOT_RUN with UNAVAILABLE

[duke]

Changeset: e097cdb0
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2023-05-23 12:06:31 +0000
URL:       https://git.openjdk.org/loom/commit/e097cdb0fbcdea60465894f2b6f287b6af5ce20a

Replace RUNNING/NOT_RUN with UNAVAILABLE

! src/java.base/share/classes/java/util/concurrent/StructuredTaskScope.java
! test/jdk/java/util/concurrent/StructuredTaskScope/StructuredTaskScopeTest.java
! test/jdk/java/util/concurrent/StructuredTaskScope/WithScopedValue.java