[mutter] Rename the master branch to main

[Marge Bot <marge-bot src gnome org>]

commit 3b49ecea9f6fe97429ef66b3ca8c8ff4ee91ede7
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Jul 14 20:53:09 2021 +0200

    Rename the master branch to main
    
    It's a more inclusive name, has the same tab-completion prefix, and is
    the default choice for new repositories created locally by git, and on
    GitHub and GitLab.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1930>

 .gitlab-ci/meson-junit-report.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci/meson-junit-report.py b/.gitlab-ci/meson-junit-report.py
index 248ef6e2b1..6370ffa352 100755
--- a/.gitlab-ci/meson-junit-report.py
+++ b/.gitlab-ci/meson-junit-report.py
@@ -24,7 +24,7 @@ aparser.add_argument('--job-id', metavar='ID',
                      default='Unknown')
 aparser.add_argument('--branch', metavar='NAME',
                      help='Branch of the project being tested',
-                     default='master')
+                     default='main')
 aparser.add_argument('--output', metavar='FILE',
                      help='The output file, stdout by default',
                      type=argparse.FileType('w', encoding='UTF-8'),