Apparently, some sites are exposing their varnish version (#2187)

* Apparently, some sites are exposing their varnish version

This can be tested [here](https://en.wikipedia.org/wiki/Erlk%C3%B6nig_(Goethe))

* Simplify the regexp, since it's a `search` and not a `match`

src/apps.json

@@ -10303,7 +10303,7 @@
         23
       ],
       "headers": {
-        "Via": ".*Varnish",
+        "Via": "varnish(?: \\(Varnish/([\\d.]+)\\))?\\;version:\\1",
         "X-Varnish": "",
         "X-Varnish-Action": "",
         "X-Varnish-Age": "",