security/osv-scanner: Pin Go version to 1.19

Numerous packages currently do not support Go 1.20 yet,
and fail with the following:

version "go1.19.5" does not match go tool version "go1.20"

For now, pin the Go version used to 1.19, until upstream
supports 1.20.

security/osv-scanner/Makefile

@@ -11,7 +11,7 @@ WWW=		https://github.com/google/osv-scanner
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-USES=		go:modules
+USES=		go:1.19,modules
 
 _BUILD_VERSION=	${DISTVERSION}
 _BUILD_COMMIT=	e206217