Update rebar configs to point to main branches vs master branches

[lbakerchef]

Apparently master changed to main. So rebar stuff that points to master needs to be changed to main.

From @tas50:

hey folks I started the PR to update things to point to main
https://github.com/chef/chef-server/pull/2762
#2762 Update branch references to point at main
We moved all our projects to main
Signed-off-by: Tim Smith [email protected]
<https://github.com/chef/chef-server|chef/chef-server>chef/chef-server | Yesterday at 9:41 PM | Added by GitHub

there's going to be more required to make that work

all the rebar configs need to point at the right branches

someone who has a clue how erlang works probably wants to finish that PR

[PrajaktaPurohit]

can be closed once it is added to Jira.