Bump rdoc from 5.1.0 to 6.3.1

[dependabot[bot]]

Bumps rdoc from 5.1.0 to 6.3.1.

Commits

• 9307f93 Version 6.3.1
• a7f5d6a Use File.open to fix the OS Command Injection vulnerability in CVE-2021-31799
• 06112d5 Merge pull request #806 from kamipo/patch-1
• bf7e134 Fix typo Genrate -> Generate
• 9a3c1f1 Don't need to install bundler manually
• 39f9802 Use stable version of actions/checkout
• 2fdfbfe Merge pull request #803 from olleolleolle/patch-1
• f7145b8 CI: Use jruby-9.2.17.0
• 2810ec5 Merge pull request #800 from nobu/rdoc-links
• f18b27b Links to document texts without "rdoc-ref:" prefix
• Additional commits viewable in compare view

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