Enable "Always suggest updating pull request branches" (align with py-libp2p)

[acul71]

Summary

multiformats/py-multiaddr and libp2p/py-libp2p use different GitHub repository settings for keeping PR branches in sync with the default branch.

Repo	allow_update_branch	Default branch
libp2p/py-libp2p	true	main
multiformats/py-multiaddr	false	master

(allow_update_branch is the API field for the UI option Settings → General → Pull Requests → Always suggest updating pull request branches.)

Why it matters

When this setting is disabled, GitHub often does not show the Update branch control on a PR—even if the branch is behind master and merges cleanly—unless branch protection requires branches to be up to date before merging.

Maintainers and contributors may still merge (squash/rebase/merge commit), but syncing the PR branch with the latest default branch is less discoverable: authors are more likely to rely on manual git fetch / git merge origin/master (or rebase) on their fork.

With the setting enabled (as on py-libp2p), GitHub suggests Update branch / Update with rebase when a PR is behind the base branch, has no conflicts, and the viewer has permission to update the head branch (docs).

This came up while reviewing fork PRs where local git rev-list showed divergence from origin/master, but the GitHub UI did not offer Update branch on py-multiaddr.

Proposal

Enable Always suggest updating pull request branches on multiformats/py-multiaddr to match libp2p/py-libp2p, unless there is a deliberate reason to keep it off.

Tasks (maintainers)

• Repo Settings → General → Pull Requests → enable Always suggest updating pull request branches
• (Optional) Note the convention in contributor docs if we document PR workflow anywhere

Notes

• This does not force PRs to be up to date before merge; it only makes the update action easier to find when appropriate.
• Update branch still requires write access to the repository that owns the PR head branch (fork authors, or upstream maintainers when Allow edits by maintainers is enabled on the PR).

[acul71]

Opened PR #132 with newsfragment 131.internal.rst (Fixes #131).

The GitHub repo setting still needs to be enabled by someone with admin on this repo:

gh api repos/multiformats/py-multiaddr -X PATCH -f allow_update_branch=true

Current API state: allow_update_branch: false. Issue will auto-close when #132 merges.