Planting new `update-ref refs/heads/new-branch` lines in git-rebase-todo adds semi to end of branch names

What did you do before the bug happened? (Steps to reproduce your issue)

1. Run `git rebase -i next` with `--update-refs` or the git config
setting `rebase.updateRefs = true`
2. Given `git-rebase-todo`:
```
pick fjr23j3 foo bar
pick j3j413 bar bar
```

3. Add a new update-ref line like so.
```
pick fjr23j3 foo bar
update-ref refs/heads/devin/foo/bar/bar/bar/branch-new-name;

pick j3j413 bar bar ``` `devin/foo/bar/bar/bar/branch-new-name` branch name does not already exist. The intention here is to create a new branch name at this point in the history (to create a stacked PR).

3. Complete rebase, see this output:
```
Successfully rebased and updated
refs/heads/devin/foo-821-analytics-for-checkout.
Updated the following refs with --update-refs:
        refs/heads/devin/edit-step-1-copy  // <-- no semi
        refs/heads/devin/edit-step-2-copy  // <-- no semi
        refs/heads/devin/refactor-foolytics;    // <-- Trailing semi
        refs/heads/devin/foo-821-analytics-for-checkout;  // <-- Trailing semi
```
4.
$ git branch
  devin/edit-step-1-copy
  devin/edit-step-2-copy
  devin/refactor-foolytics;
  devin/rename-logAnalyticsEvents;
  devin/foo-731-add-segment-tracking-to-tutorialfoocom
  devin/foo-736-lock-checkout-behind-a-query-param
  devin/foo-779-add-segment-events-for-all-clicksuser
  devin/foo-779-add-segment-events-for-all-clicksuser;
  devin/foo-808-button-to-re-try-failed-checkout
  devin/foo-808-button-to-re-try-failed-checkout;
* devin/foo-821-analytics-for-checkout
  devin/foo-821-analytics-for-checkout;
+ devin/foo-828-add-sentry-to-tutorialfoocom
  devin/sort-tailwind-classes
  fix/crashing-on-falsy-amazonProductID
  main
  refactor-foolytics

5. After rebasing, paste a series of git push commands into vscode's
integrated terminal:
```
git push origin --force-with-lease
devin/edit-step-1-copy:refs/heads/devin/edit-step-1-copy;
git push origin --force-with-lease
devin/edit-step-2-copy:refs/heads/devin/edit-step-2-copy;
```
I wasn't paying perfect attention to the semicolon at the end of these
git push lines.
Some may have included a semi, some not.

I think at some point, I converted a series of `git push` commands BACK into `update-ref` commands, because I did a weird rebase thing and the `update-ref` lines didn't appear on the next rebase.

This is probably an error on my part, but `update-ref` lines added to `git-rebase-todo` should fail if they end with a semicolon, and the user should be forced to remove them.

[System Info] git version: git version 2.38.1 cpu: arm64 no commit associated with this build sizeof-long: 8 sizeof-size_t: 8 shell-path: /bin/sh feature: fsmonitor--daemon uname: Darwin 21.6.0 Darwin Kernel Version 21.6.0: Thu Sep 29 20:13:46 PDT 2022; root:xnu-8020.240.7~1/RELEASE_ARM64_T8101 arm64 compiler info: clang: 14.0.0 (clang-1400.0.29.102) libc info: no libc information available $SHELL (typically, interactive shell): /bin/zsh

[Environment] Using arm-native macOS terminal zsh --version: zsh 5.8.1 (x86_64-apple-darwin21.0)

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