[gnome-control-center] build: Use non-deprecated python module to search for python

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 2e37c9d87c5672d250d9b46a0019b2325e23aa5b
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sat Sep 12 13:22:33 2020 -0300

    build: Use non-deprecated python module to search for python

 meson.build | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 250f617c7..d55f33162 100644
--- a/meson.build
+++ b/meson.build
@@ -30,8 +30,8 @@ enable_tracing = get_option('tracing')
 
 config_h = configuration_data()
 
-py3 = import('python3')
-python = py3.find_python()
+py = import('python')
+python = py.find_installation('python3')
 
 config_h.set_quoted('TEST_NM_PYTHON', python.path())