ci: Update `GITHUB_TOKEN` for `semantic-release`

[ajschmidt8]

This change switches the GITHUB_TOKEN used by semantic-release to the WORKFLOW_TOKEN, which is a PAT for the GPUtester user.

This should hopefully get us passed the release issue below:

• https://github.com/rapidsai/dependency-file-generator/actions/runs/8008126855/job/21873843459#step:5:666

This problem was introduced in #62, when I tried to replace my own PAT with the default GITHUB_TOKEN.

[GPUtester]

:tada: This PR is included in version 1.9.0 :tada:

The release is available on:

• GitHub release
• PyPI release

Your semantic-release bot :package::rocket: