main/postgresql13: upgrade to 13.15

main/postgresql13/APKBUILD

@@ -2,7 +2,7 @@
 # Contributor: G.J.R. Timmer <gjr.timmer@gmail.com>
 # Contributor: Jakub Jirutka <jakub@jirutka.cz>
 _pkgname=postgresql
-pkgver=13.14
+pkgver=13.15
 pkgrel=0
 _majorver=${pkgver%%.*}
 # Should this aport provide libpq* and libecpg*? true/false
@@ -487,7 +487,7 @@ _setdiff() {
 }
 
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