[calls] Add python3-docutils as build dependency

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 73109fb235053d9516db503954d5b3247e01cec8
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Tue May 31 16:05:16 2022 +0200

    Add python3-docutils as build dependency
    
    We want to use rst2man for generating manpages.

 debian/control | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/debian/control b/debian/control
index b5edc31e..439ab8fc 100644
--- a/debian/control
+++ b/debian/control
@@ -29,6 +29,7 @@ Build-Depends:
  meson,
  modemmanager-dev,
  pkg-config,
+ python3-docutils,
  valac,
  xauth,
  xvfb,