Straggler commit related to #2145

I have learned the hard way that we need to more fully reverse github_lock_branch() in order to be able to delete a branch later. Learned with a PR branch. Won't come up often IRL because we will mostly lock / unlock `main`. But still better to leave things as we found them.

Author: jennybc

R/github.R

@@ -302,7 +302,7 @@ github_unlock_branch <- function(branch = NULL) {
     branch = branch,
     # required parameters
     required_status_checks = NA,
-    enforce_admins = TRUE,
+    enforce_admins = FALSE,
     required_pull_request_reviews = NA,
     restrictions = NA,
     # paramater that actually does what we want