Bump version for release.

NEWS

@@ -1,4 +1,4 @@
-1.9.4.dev0
+1.9.4
  * #80 (beta): Add an LVM hook for snapshotting and backing up LVM logical volumes. See the
    documentation for more information:
    https://torsion.org/borgmatic/docs/how-to/snapshot-your-filesystems/

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "borgmatic"
-version = "1.9.4.dev0"
+version = "1.9.4"
 authors = [
   { name="Dan Helfman", email="witten@torsion.org" },
 ]