Fix name.

.github/workflows/run-tests.yml

@@ -42,7 +42,7 @@ jobs:
  run: |
  # Without the --overwrite flag Homebrew complains about [email protected] files that are overwritten.
  # We need pygobject from PyPI. Using only pygobject3 from homebrew leads to "gi module not found".
- brew install --ignore-dependencies gtk3
+ brew install --ignore-dependencies gtk+3
  brew install dbus ca-certificates readline libxfixes libxi libxtst at-spi2-core gdk-pixbuf gsettings-desktop-schemas hicolor-icon-theme libepoxy fribidi pango
  brew install gettext gobject-introspection glib libffi cairo gtksourceview3 librsvg adwaita-icon-theme enchant
  python3 -m pip install pyenchant pygobject pyyaml