4.21.0

Part-of: <https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/9000>

NEWS

diff --git a/NEWS b/NEWS
index 6c62af3..342e4a7 100644
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-Overview of Changes in 4.21.0, xx-xx-xxxx
+Overview of Changes in 4.21.0, 29-09-2025
 =========================================
 
 * Symbolic icons can now be stateful and animated. A new CSS