[release-1.13] Bump to v1.13.1

As the title says

In prep for Feature Freeze testing for RHEL 8.9/9.3

[NO NEW TESTS NEEDED]

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

version/version.go

 package version
 
 // Version is the version of the build.
-const Version = "1.13.1-dev"
+const Version = "1.13.1"