cargo: revert the change to 2021 edition

See https://gitlab.gnome.org/GNOME/gnome-build-meta/-/merge_requests/1498#note_1367023

cargo: revert the change to 2021 edition
be014fca · Bilal Elmoussaoui · 78fd960d · be014fca
Commit be014fca authored Jan 27, 2022 by Bilal Elmoussaoui
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Cargo.toml Cargo.toml +1 -1

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--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "gnome-tour"
 version = "40.0.0"
 authors = ["Bilal Elmoussaoui <bil.elmoussaoui@gmail.com>"]
-edition = "2021"
+edition = "2018"


 [dependencies]