[varnish] vsv0007 fixes

Mainly http://varnish-cache.org/security/VSV00007.html#vsv00007

But also switch to keyserver.ubuntu.com for the key server

library/varnish

@@ -1,13 +1,13 @@
-# this file was generated using https://github.com/varnish/docker-varnish/blob/51a66e74c3a56e4def767d3ad3f6c8ad1a4addaa/populate.sh
+# this file was generated using https://github.com/varnish/docker-varnish/blob/4cfd65e1d3bd4eb9518d8e7590d9fec1de6a50c4/populate.sh
 Maintainers: Guillaume Quintard <[email protected]> (@gquintard)
 GitRepo: https://github.com/varnish/docker-varnish.git
 
-Tags: 6.0, 6.0.7-1, 6.0.7, stable
+Tags: 6.0, 6.0.8-1, 6.0.8, stable
 Architectures: amd64
 Directory: stable/debian
-GitCommit: 51a66e74c3a56e4def767d3ad3f6c8ad1a4addaa
+GitCommit: 4cfd65e1d3bd4eb9518d8e7590d9fec1de6a50c4
 
-Tags: 6.6, 6.6.0-1, 6.6.0, 6, latest, fresh
+Tags: 6.6, 6.6.1-1, 6.6.1, 6, latest, fresh
 Architectures: amd64
 Directory: fresh/debian
-GitCommit: 51a66e74c3a56e4def767d3ad3f6c8ad1a4addaa
+GitCommit: 4cfd65e1d3bd4eb9518d8e7590d9fec1de6a50c4