Release os-traits 1.0.0

Since [1] made some (theoretically, not realistically) breaking changes,
do a major bump. As it happens, we hadn't had an official release of
os-traits yet, but we're using it quite officially, so this does double
duty.

[1] https://review.opendev.org/#/c/687378/

Change-Id: I7212a8e73a852bf89e6f8fb26edef4b91df8a31b

deliverables/_independent/os-traits.yaml

@@ -28,5 +28,9 @@ releases:
     projects:
       - repo: openstack/os-traits
         hash: 5a477b8aed198fbece7cc508ee15ad46fd9e1437
+  - version: 1.0.0
+    projects:
+      - repo: openstack/os-traits
+        hash: fc685f9e3b3572574d2d80a5efb3f1648ea0b4eb
 repository-settings:
   openstack/os-traits: {}