Bump generator-jhipster from 4.9.0 to 6.3.1

[dependabot[bot]]

Bumps generator-jhipster from 4.9.0 to 6.3.1.

Commits

• 61f2122 Release v6.3.1
• e6cdd4a Merge pull request from GHSA-mc84-xr9p-938r
• e156daf Remove Checkstyle
• 7a43da8 Merge pull request #10163 from mshima/use_existing_data
• 51163b8 Migrate checktyle.xml to the root directory of the project, fix ESLint issues
• 063553c Merge pull request #10454 from murdos/fix-formatting-added_entity_changelog
• 53d2d40 Update checkstyle plugin version
• b3ff210 Correct checktyle.xml file location
• 1c32c42 Rename checktyle file as it is not an EJS template
• cecd357 Rename checktyle file as it is not an EJS template
• Additional commits viewable in compare view

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