Bump version for release.

NEWS

@@ -1,4 +1,4 @@
-1.8.12.dev0
+1.8.12
  * #817: Add a "--max-duration" flag to the "check" action and a "max_duration" option to the
    repository check configuration. This tells Borg to interrupt a repository check after a certain
    duration.

setup.py

@@ -1,6 +1,6 @@
 from setuptools import find_packages, setup
 
-VERSION = '1.8.12.dev0'
+VERSION = '1.8.12'
 
 
 setup(