[3.18] main/expat: security upgrade to 2.7.0

https://github.com/libexpat/libexpat/blob/R_2_7_0/expat/Changes

• CVE-2024-8176

main/expat/APKBUILD

 # Maintainer: Carlo Landmeter <clandmeter@alpinelinux.org>
 pkgname=expat
-pkgver=2.6.4
+pkgver=2.7.0
 pkgrel=0
 pkgdesc="XML Parser library written in C"
 url="https://libexpat.github.io/"
@@ -14,6 +14,8 @@ depends_dev="$pkgname=$pkgver-r$pkgrel"
 subpackages="$pkgname-static $pkgname-dev $pkgname-doc lib$pkgname:libs"
 
 # secfixes:
+#   2.7.0-r0:
+#     - CVE-2024-8176
 #   2.6.4-r0:
 #     - CVE-2024-50602
 #   2.6.3-r0:
@@ -73,5 +75,5 @@ package() {
 }
 
 sha512sums="
-cd21a5cfafe15b747e6e8964e35eed52a446373811d02bc3730b3e616ccd066f07e4cdbd48f445d6fddfb931841b28072016248b19a8add9cf087cbf83ba18da  expat-2.6.4.tar.bz2
+5c21df2c84b20e3021ab62674b6afbc68a00f37d2b1e6120632d8aeb02cf4bd9bd925da9ff696ab34b3c188c59cd461df41e5d4b287de53f9034729d434c34d7  expat-2.7.0.tar.bz2
 "