Fix rdoc parsing of nil text tokens + backport moderate CVEs.

Merge Request Required Information

Summary of Changes

Context of the pull-request:

Finalization of MR !15 (closed). The MR fixes issue of RDoc erroring when there is a comment on a multiline method chain such as this:

method1 #comment
  .method2

The test included with the patch tests this behavior. Note that I had to adjust the test file path to the test in the upstream patch to apply it correctly to Ruby sources.

I have added a commit that fixes build failures. See commit message and related links in the specfile for more detailed explanation.

RPM scratch build: https://brew*****.redhat.com/brew/taskinfo?taskID=53405751

C8S scratch build: https://kojihub.stream.rdu2.redhat.com/koji/taskinfo?taskID=2367557

Modular scratch build: https://mbs.stream.rdu2.redhat.com/module-build-service/2/module-builds/464

TODO:

• Cleanup the repo from extra files. Similarly to the recent 2.7.8 upgrade in !14 (merged). Done.
• Check other gems in the Ruby 2.5 module that they have correct content. Done. rubygem-posgresql needs a fix for FTBFS (rubygem-pg!4 (merged)), other rubygems only have SHA512 introduction in sources and changes in .gitignore. Nothing warranting a fix.

Pull-request or commit in Fedora Rawhide:

Not required for the RDoc issue, 2.6 upto 3.2 (didn't test further and upstream has test included), are not affected, and the rest are CVEs that are already fixed in Fedora versions.

Select priority:

• urgent
• high
• medium
• low
• unspecified

Do you need someone's review?:

• Yes Later when I clear the TODO items.
• No, because:

Approved Bugzilla Ticket

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rhbz#2210326