sources: Use make deps to vendor modules

The `Makefile` has a conditional step that modifies some source code
when building with LZO compression support.

sources.sh

@@ -10,6 +10,6 @@ git clone \
 
 cd wal-g-${version}
 go mod tidy
-go mod vendor
+make deps USE_LZO=1
 cd ..
 tar -cf wal-g-${version}.tar.gz wal-g-${version}