[calls] main-window: Bump copyright year in about window

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 8bf2f2cf1df249a6d041445ed6d0e8b7b898ba27
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Sun Feb 13 00:00:23 2022 +0100

    main-window: Bump copyright year in about window

 src/calls-main-window.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/calls-main-window.c b/src/calls-main-window.c
index 4823397a..09ed527d 100644
--- a/src/calls-main-window.c
+++ b/src/calls-main-window.c
@@ -117,7 +117,7 @@ about_action (GSimpleAction *action,
   gtk_show_about_dialog (GTK_WINDOW (self),
                          "artists", artists,
                          "authors", authors,
-                         "copyright", "Copyright © 2018 - 2021 Purism",
+                         "copyright", "Copyright © 2018 - 2022 Purism",
                          "documenters", documenters,
                          "license-type", GTK_LICENSE_GPL_3_0,
                          "logo-icon-name", APP_ID,