Chore: Update common-packer

Update to fetch Centos8 vars templates

Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
Change-Id: I1d95f1cefabb6b0706c2e79595ab27cda0c063d3

diff --git a/packer/common-packer b/packer/common-packer
index 3dcae183d810816f31950afbe1fa08fa948e61fe..4f1cbe1829ee56317c6bd59033635390c5e8ff9c 160000 (submodule)
--- a/packer/common-packer
+++ b/packer/common-packer
@@ -1 +1 @@
-Subproject commit 3dcae183d810816f31950afbe1fa08fa948e61fe
+Subproject commit 4f1cbe1829ee56317c6bd59033635390c5e8ff9c