Add generated YAML document end markers to dependency license metadata cache

The dependency license metadata is generated by the "Licensed" tool. The version of the tool now in use adds YAML
document end markers to some metadata files, which were not present in the files generated by the tool at the time the
cache was established.

I don't know why it adds these markers to only some of the metadata files, but they are valid (though optional so the
files without are also correct) and machine generated content is used as-is.

The metadata files are hereby updated to use the format produced by the version of the "Licensed" tool currently in use.

Author: per1234

.licenses/libraries-repository-engine/go/github.com/xanzy/ssh-agent.dep.yml

@@ -216,3 +216,4 @@ licenses:
     Version 2.0 (the "License"); you may not use this file except in compliance with
     the License. You may obtain a copy of the License at <http://www.apache.org/licenses/LICENSE-2.0>
 notices: []
+...

.licenses/libraries-repository-engine/go/go.bug.st/relaxed-semver.dep.yml

@@ -42,3 +42,4 @@ licenses:
     POSSIBILITY OF SUCH DAMAGE.
 
 notices: []
+...