"Delete local branches" is showing branches that have already been deleted

[MetRonnie]

• Extension version:
• VSCode Version: 1.120.0
• OS: Linux x64 5.14.0-611.54.1.el9_7.x86_64
• Repository Clone Configuration: fork of an upstream repository
• GitHub Product: GitHub.com

Steps to Reproduce:

1. Run the "Delete local branches and remotes" command (pr.deleteLocalBranchesNRemotes)
2. It shows branches that no longer exist
3. .git/config for the repo still contains [branch "<name>"] sections