Merge rust-bitcoin/rust-bitcoin#2548: tweak nightly CI update

6b3c8b9f6b ci: use personal access token for daily nightly update (Andrew Poelstra)
775d0c74cd ci: change automatic CI bot committer name to something without special characters (Andrew Poelstra)
aa8655552b ci: change branch of nightly bot to not conflict with rustfmt bot (Andrew Poelstra)

Pull request description:

  Rename the bot's committer name to not have special characters, which causes some problem in tcharding's locale; also change the branch name to not overlap with the "weekly CI" job, since it's causing the two jobs to overwrite each others' PRs.

  Was part of #2531 but pulled out here to be in a branch that isn't getting clobbered every 24 hours :).

ACKs for top commit:
  tcharding:
    ACK 6b3c8b9f6b

Tree-SHA512: 2e605991132eb36543d8fb2636bc70c7cc834db6078d2cc6242c65c0f8c5fd270fc9881e6a5c28f5d87a03551fa4f1e0ad3e87c86c226db5e5b8a4c21270ef8c

.github/workflows/cron-daily-update-nightly.yml

@@ -31,8 +31,11 @@ jobs:
         if: env.changes_made == 'true'
         uses: peter-evans/create-pull-request@v6
         with:
+          token: ${{ secrets.APOELSTRA_CREATE_PR_TOKEN }}
           author: Update Nightly Rustc Bot <bot@example.com>
+          committer: Update Nightly Rustc Bot <bot@example.com>
           title: Automated daily update to rustc (to nightly-${{ env.nightly_date }})
           body: |
            Automated update to Github CI workflow `rust.yml` by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action
           commit-message: Automated update to Github CI to rustc nightly-${{ env.nightly_date }}
+          branch: create-pull-request/daily-nightly-update