label input is parsed incorrectly when labels contain "/" characters

[dwydler]

After upgrading devops-infra/action-pull-request from v1.2.1 to v1.3.0, creating pull requests fails when using labels containing /.

Workflow example

- name: Create pull request
  id: pullrequest
  uses: devops-infra/action-pull-request@v1.3.0
  with:
    github_token: ${{ steps.generate-token.outputs.token }}
    source_branch: test1/test2/test3
    target_branch: master
    title: test1
    label: OS: test5,OS: test1,test2/test3
    assignee: test4

Expected behavior
The pull request should be created with these labels:

• OS: test5
• OS: test1
• test2/test3

Actual behavior
The action fails with:

Running: gh pr create --repo org/test5 --base master --head org:test1/test2/test3...
could not add label: 'test2/test3' not found

The label value is interpreted incorrectly. It looks like the branch name suffix is being passed as a label.

Additional information
The action output shows that the input is received correctly:
label: OS: Ubuntu,OS: test1,test2/test3

Environment

• GitHub Actions runner
• GitHub CLI version: 2.95.0
• devops-infra/action-pull-request@v1.3.0

The issue only happens with v1.3.0. The identical workflow succeeds with v1.2.1.