Fix the branch_regex for Fedora EPEL so that it also matches on el6

This was reported by a former maintainer of the freerdp rpm where the
Fedora EPEL CC list was not being updated because the only EPEL branch
still active in PDC was the el6 branch. Thus the script was never
matching Fedora EPEL as being still active and as a result it was not
updating it.

By adjusting the regex, we solve this issue.

Fixes https://pagure.io/fedora-infrastructure/issue/9122

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

distgit_bugzilla_sync/default-config-files/configuration.toml

@@ -21,7 +21,8 @@ ignorable_accounts = ["packagerbot", "zuul"]
         namespace = "modules"
         versions = []
     [products."Fedora EPEL"]
-        branch_regex = '^epel\d+$'
+        # To simplify to '^epel\d+$' once EL6 is EOL.
+        branch_regex = '^e(pe)?l\d+$'
         versions = ["epel8", "epel7", "el6"]
 
 [pdc_types]