community/go: upgrade to 1.20.3

See https://groups.google.com/g/golang-announce/c/Xdv6JL9ENs8

community/go/APKBUILD

@@ -4,8 +4,8 @@
 # Maintainer: Sören Tempel <soeren+alpine@soeren-tempel.net>
 pkgname=go
 # go binaries are statically linked, security updates require rebuilds
-pkgver=1.20.2
-pkgrel=1
+pkgver=1.20.3
+pkgrel=0
 pkgdesc="Go programming language compiler"
 url="https://go.dev/"
 arch="all"
@@ -45,6 +45,11 @@ provider_priority=100 # highest
 #     - CVE-2022-41716
 #     - CVE-2022-41720
 #     - CVE-2022-41722
+#   1.20.3-r0:
+#     - CVE-2023-24537
+#     - CVE-2023-24538
+#     - CVE-2023-24534
+#     - CVE-2023-24536
 #   1.20.2-r0:
 #     - CVE-2023-24532
 #   1.20.1-r0:
@@ -259,7 +264,7 @@ package() {
 }
 
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