lang/go120: Update to 1.20.3

Changes:	https://go.dev/doc/devel/release#go1.20.3

Security:	348ee234-d541-11ed-ad86-a134a566f1e6

lang/go120/Makefile

-DISTVERSION=	1.20.2
+DISTVERSION=	1.20.3
 # Always set PORTREVISION explicitly as otherwise they are inherited from lang/go-devel
 PORTREVISION=	0
 MASTER_SITES=	https://golang.org/dl/ \

lang/go120/distinfo

-TIMESTAMP = 1678287008
-SHA256 (go1.20.2.src.tar.gz) = 4d0e2850d197b4ddad3bdb0196300179d095bb3aefd4dfbc3b36702c3728f8ab
-SIZE (go1.20.2.src.tar.gz) = 26178725
+TIMESTAMP = 1680872168
+SHA256 (go1.20.3.src.tar.gz) = e447b498cde50215c4f7619e5124b0fc4e25fb5d16ea47271c47f278e7aa763a
+SIZE (go1.20.3.src.tar.gz) = 26184364
 SHA256 (go-freebsd-arm64-go1.20.tar.xz) = 674e0a9bce8b64dcc085b000eb83ae880e96be1ee47dad6ec86c82dbe5550623
 SIZE (go-freebsd-arm64-go1.20.tar.xz) = 32640640
 SHA256 (go-freebsd-amd64-go1.20.tar.xz) = 170f612c4b8a59400f27d642aab37afa831fe2d6df3e7473dec2d4574a59a46c