Add news item for GH658

Closes #4912

Author: Komzpa

NEWS

@@ -9,6 +9,7 @@ PostGIS 3.3.0dev
   - #5040, add postgis_sfcgal_full_version (Loïc Bartoletti)
   - GH655, GiST: balance the tree splits better in recursive calls (Darafei Praliaskouski)
   - GH657, GiST: do not call no-op decompress function (Aliaksandr Kalenik)
+  - #4912, GiST: fix crash on STORAGE EXTERNAL for geography (Aliaksandr Kalenik)
 
 PostGIS 3.2.0 (Olivier Courtin Edition)
 2021/12/17