Fix up vault baseurls

Fix the source repository (which are in vault.centos.org) URLs as well.

migrate2rocky/migrate2rocky.sh

@@ -746,6 +746,7 @@ package_swaps() {
             -e 's/^\[/['"$stream_prefix"'/' \
             -e 's|^mirrorlist=|#mirrorlist=|g' \
             -e 's|^#baseurl=http://mirror.centos.org/$contentdir/$stream/|baseurl=|http://mirror.centos.org/centos/8-stream/' \
+            -e 's|^baseurl=http://vault.centos.org/$contentdir/$stream/|baseurl=|https://vault.centos.org/centos/8-stream/' \
 	    "${repos_files[@]}"
     fi