Bump 3.17.4 release

The Calendar development team proudly announces the availability
of GNOME Calendar 3.17.3 release!

Major changes for this version:
* Fixed GNOME Calendar's category (Igor Gnatenko)
* Added initial keyboard navigation for Month View
* Various code cleanups and fixes
* Updated translations for:
  * Dutch
  * Hebrew
  * Hungarian
  * Portuguese
  * Russian
  * Slovenian
  * Spanish
  * Swedish
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