Drop dh argument --parallel, useless since debhelper compat 10

Parallel building is now enabled by default.

Fix lintian tag: debian-rules-uses-unnecessary-dh-argument
See: https://udd.debian.org/lintian-tag.cgi?tag=debian-rules-uses-unnecessary-dh-argument



Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

debian/rules

@@ -6,7 +6,7 @@ export DEB_BUILD_MAINT_OPTIONS = hardening=+all
 include /usr/share/dpkg/default.mk
 
 %:
-	dh $@ --with gir --parallel
+	dh $@ --with gir
 
 override_dh_auto_configure:
 	dh_auto_configure \