Remove PR requirement for changes to beyond-refs wiki

[tmandry]

No description provided.

[github-actions]

Dry-run check results

[WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
[INFO  sync_team] synchronizing crates-io
[INFO  sync_team] synchronizing github
[INFO  sync_team] 💻 Repo Diffs:
    📝 Editing repo 'rust-lang/beyond-refs':
      Branch Protections:
          main
            Requires PR: true => false
    📝 Editing repo 'rust-lang/bors':
      Rulesets:
          Ruleset for main
            No changes