chore: Extend the "listenablefuture" curation to version 1.0

Also version 1.0 is only "an empty artifact that Guava depends on to
signal that it is providing ListenableFuture", "if users want only
ListenableFuture, they depend on listenablefuture-1.0", see [1].

[1]: https://mvnrepository.com/artifact/com.google.guava/listenablefuture

Signed-off-by: Sebastian Schuberth <[email protected]>

Author: sschuberth

curations/Maven/com.google.guava/listenablefuture.yml

@@ -1,3 +1,8 @@
+- id: "Maven:com.google.guava:listenablefuture:1.0"
+  curations:
+    comment: |
+      This library is empty as its version string suggests.
+    is_metadata_only: true
 - id: "Maven:com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava"
   curations:
     comment: |