Simplify deployment.yml

[koppor]

Applying the most recent documentation from: https://github.com/actions/checkout#fetch-all-history-for-all-tags-and-branches

• Change in CHANGELOG.md described (if applicable)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked documentation: Is the information available and up to date? If not created an issue at https://github.com/JabRef/user-documentation/issues or, even better, submitted a pull request to the documentation repository.

[Siedlerchr]

You need to specify fetch depth 0 because default is set to 1. (im on mobile)

[koppor]

And this is what was in the screenshot, but not in the commit 🙈