debhelper: bump compat to 12 (latest in stretch-backports)

I have checked with debdiff that nothing has changed, and skimread the
upgrading checklist.

Closes: #965452
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/debian/compat b/debian/compat
index 7ed6ff82de6bcc2a78243fc9c54d3ef5ac14da69..48082f72f087ce7e6fa75b9c41d7387daecd447b 100644 (file)
--- a/debian/compat
+++ b/debian/compat
@@ -1 +1 @@
-5
+12