Update PULL_REQUEST_TEMPLATE.md

[gcs-devel]

Description

Fixes the pr template.

Maintainers

Please ensure that you check for:

• [ ] If this change impacts git cache validity, it bumps the git cache serial number
• [ ] If this change impacts compatibility with omnibus-software, the corresponding change is reviewed and there is a release plan
• [ ] If this change impacts compatibility with the omnibus cookbook, the corresponding change is reviewed and there is a release plan

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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