[librsvg: 1/2] Rename references to the master branch to main

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

commit bfbf12774d67615fe6c49e8a4a54ee003ace400d
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Sep 28 16:37:16 2021 -0500

    Rename references to the master branch to main
    
    Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/594>

 .gitlab-ci.yml  | 8 ++++----
 CONTRIBUTING.md | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c34959a0..91867e49 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -137,15 +137,15 @@ cargo_bench:
     sudo -E git checkout ${CI_DEFAULT_BRANCH}
     for BENCH in "${BENCHES[@]}"
     do
-      sudo -E cargo bench --bench $BENCH -- --noplot --save-baseline master
+      sudo -E cargo bench --bench $BENCH -- --noplot --save-baseline main
     done
     sudo -E git checkout ${CI_COMMIT_SHA}
     for BENCH in "${BENCHES[@]}"
     do
-      sudo -E cargo bench --bench $BENCH -- --noplot --baseline master
+      sudo -E cargo bench --bench $BENCH -- --noplot --baseline main
     done
   rules:
-    - if: '$CI_PIPELINE_SOURCE == "push" && $CI_COMMIT_BRANCH != "master"'
+    - if: '$CI_PIPELINE_SOURCE == "push" && $CI_COMMIT_BRANCH != "main"'
       when: manual
       allow_failure: true
   artifacts:
@@ -241,4 +241,4 @@ pages:
     paths:
       - public
   rules:
-    - if: '$CI_COMMIT_BRANCH == "master"'
+    - if: '$CI_COMMIT_BRANCH == "main"'
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 078dbb1c..3a9b3dea 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -19,7 +19,7 @@ the web interface here:
 
 https://gitlab.gnome.org/GNOME/librsvg
 
-Development happens in the master branch.  There are also branches for
+Development happens in the `main` branch.  There are also branches for
 stable releases.
 
 Alternatively, you can use the mirror at Github:
@@ -293,4 +293,4 @@ interesting options to generate plots and such.  You can see the
 [benches]: rsvg-internals/benches
 [Criterion]: https://crates.io/crates/criterion
 [criterion-options]: https://japaric.github.io/criterion.rs/book/user_guide/command_line_options.html
-[docker-tests-readme]: tools/docker/README.md
\ No newline at end of file
+[docker-tests-readme]: tools/docker/README.md