[6.6] 48db9c98f Change the pkg-varnish-cache branch to 6.6

[Martin Blix Grydeland]

commit 48db9c98f1cacc2da5ceed5713a91df9eb704673
Author: Martin Blix Grydeland <martin at varnish-software.com>
Date:   Thu Mar 18 12:59:51 2021 +0100

    Change the pkg-varnish-cache branch to 6.6

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7143b68d8..4eb783a6b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -12,7 +12,7 @@ parameters:
     default: "HEAD"
   pkg-commit:
     type: string
-    default: "master"
+    default: "6.6"
   dist-url:
     type: string
     default: ""