Log Message:
gtksourceview3: update to 3.24.5.

News in 3.24.5
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* Bug fix in gtk_source_view_indent_lines().
* Improvements to the Visual Studio builds.
* Improvements to the syntax highlighting of: Vala.
* Translation updates.

News in 3.24.4
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* Fix bug when GtkSourceView:indent-width and :tab-width are equal.
* New syntax highlighting definition files for: Swift, Maxima and Kotlin.
* Improvements to the syntax highlighting of: CSS.
* Various other small improvements.
* Translation updates.