debian: set compat level to 10

Related: OS#5958
Change-Id: If00d77a3b83fa7ba000a346f087a6baf1966fdff
diff --git a/debian/control b/debian/control
index bef8691..f914c63 100644
--- a/debian/control
+++ b/debian/control
@@ -2,7 +2,7 @@
 Section: net
 Priority: extra
 Maintainer: Osmocom team <openbsc@lists.osmocom.org>
-Build-Depends: debhelper (>=9),
+Build-Depends: debhelper (>= 10),
                dh-autoreconf,
                pkg-config,
                autotools-dev,