chore: update PULL_REQUEST_TEMPLATE.md

[Radeity]

Purpose of the PR

• Synchronized update, refer to chore: add pr template incubator-hugegraph#2234

Main Changes

Verifying these changes

• Trivial rework / code cleanup without any test coverage. (No Need)
• Already covered by existing tests, such as (please modify tests here).
• Need tests and can be verified as follows:

Does this PR potentially affect the following parts?

• Nope
• Dependencies (add/update license info)
• Modify configurations
• The public API
• Other affects (typed here)

Documentation Status

• Doc - TODO
• Doc - Done
• Doc - No Need

[codecov]

Codecov Report

Merging #257 (90e556c) into master (024d1aa) will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@ ## master #257 +/- ## ========================================= Coverage 85.86% 85.86% Complexity 3235 3235 ========================================= Files 344 344 Lines 12115 12115 Branches 1092 1092 ========================================= Hits 10402 10402 Misses 1190 1190 Partials 523 523 

see 1 file with indirect coverage changes

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