Auto merge of #20488 - brainlessdeveloper:add-geckolib-build-checkmark-template, r=emilio

Add build-geckolib checkbox to pull request template

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Add a reminder to run `./mach build-geckolib` locally before submitting a PR.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #20487 (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [x] These changes do not require tests because they only affect the PR template

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