static/frontend/unit/versions/versions.tmpl: reduce vuln chip height

Wrapping the vuln chip in a plain div insulates it from the effects of
the enclosing flex box.

Change-Id: I7a2ca0a43b7170fb2d5e5c8a77c02ec4f34f9857
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/348929
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Jamal Carvalho <jamal@golang.org>

static/frontend/unit/versions/versions.tmpl

diff --git a/static/frontend/unit/versions/versions.tmpl b/static/frontend/unit/versions/versions.tmpl
index ae4ed89..9671c93 100644
--- a/static/frontend/unit/versions/versions.tmpl
+++ b/static/frontend/unit/versions/versions.tmpl
@@ -78,7 +78,7 @@
         {{else}}
           <div class="Version-commitTime">
             {{$v.CommitTime}}{{if $v.Retracted}}<div><span class="go-Chip go-Chip--inverted">retracted</span></div>{{end}}
-            {{range $v.Vulns}}{{template "vuln" .}}{{end}}
+            {{range $v.Vulns}}<div>{{template "vuln" .}}</div>{{end}}
           </div>
         {{end}}
       {{end}}