Lock `rdoc` to `v6.3.x` to avoid `psych-4.x`

Psych 4.x appears to mess with our Cucumber-based tests with:

```
Tried to load unspecified class: Date (Psych::DisallowedClass)
```
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Ashwin Maroli 2021-12-27 23:27:01 +05:30 committed by GitHub
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commit 66b399c6d3
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@ -74,7 +74,7 @@ group :jekyll_optional_dependencies do
gem "jekyll-redirect-from"
gem "kramdown-syntax-coderay"
gem "mime-types", "~> 3.0"
gem "rdoc", "~> 6.0"
gem "rdoc", "~> 6.3.0"
gem "tomlrb"
platforms :ruby, :mswin, :mingw, :x64_mingw do