Fix branch (#430)

## Type of change

<!-- (mark with an `X`) -->

```
- [ ] Bug fix
- [ ] New feature development
- [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [x] Build/deploy pipeline (DevOps)
- [ ] Other
```

## Objective
<!--Describe what the purpose of this PR is. For example: what bug
you're fixing or what new feature you're adding-->

Fix changed branch

## Code changes
<!--Explain the changes you've made to each file or major component.
This should help the reviewer understand your changes-->
<!--Also refer to any related changes or PRs in other repositories-->

* **.github/workflow/version-bump.yml:** Switch from `master` to `main`

## Before you submit

- Please check for formatting errors (`dotnet format
--verify-no-changes`) (required)
- If making database changes - make sure you also update Entity
Framework queries and/or migrations
- Please add **unit tests** where it makes sense to do so (encouraged
but not required)
- If this change requires a **documentation update** - notify the
documentation team
- If this change has particular **deployment requirements** - notify the
DevOps team

.github/workflows/version-bump.yml

@@ -64,7 +64,7 @@ jobs:
         uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
         with:
           repository: bitwarden/sdk
-          ref: master
+          ref: main
           token: ${{ steps.retrieve-secrets.outputs.github-pat-bitwarden-devops-bot-repo-scope }}
 
       - name: Import GPG key