ci: debian packaging use soname template instead of fixed number

debian/rules-template

@@ -11,7 +11,7 @@ override_dh_auto_test:
 	dh_auto_test -- ARGS+=--output-on-failure
 
 override_dh_strip:
-	dh_strip --dbg-package=libopen62541-1-dbg
+	dh_strip --dbg-package=libopen62541-<soname>-dbg
 
 %:
 	dh $@ --buildsystem=cmake --parallel