deps(scaladoc): update flexmark from 0.42.12 to 0.62.2

[ckipp01]

This pr updates the flexmark dependencies used in Scaladoc from 0.42.12, which is from 2019, up to the latest release of 0.64.0 to 0.62.2. This is mainly done to tackle a bunch of CVEs that are attached to the old versions of
flexmark.

fixes #16223

[ckipp01]

Not that I was testing out #16816 and forgot that I was when I created this. If possible, let's get that merged in and then I'll rebase to get rid of that commit on here.

[ckipp01]

Marked this back as a draft since I have tests failing and locally was only testing scaladoc. Please do comment on anything you see though.

[ckipp01]

I honestly have no idea what's going on here. scaladoc/test works with no issues. However, once you try to run the tests via cmdScaladocTests then I get:

Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class com.vladsch.flexmark.ext.tables.TablesExtension
        at dotty.tools.scaladoc.site.common$package$.defaultMarkdownOptions(common.scala:32)
        at dotty.tools.scaladoc.site.common$package$.yamlParser(common.scala:61)
        at dotty.tools.scaladoc.site.common$package$.loadTemplateFile(common.scala:73)
        at dotty.tools.scaladoc.site.StaticSiteLoader.$anonfun$4(StaticSiteLoader.scala:45)
        at scala.Option.fold(Option.scala:263)
        at dotty.tools.scaladoc.site.StaticSiteLoader.loadBasedOnYaml(StaticSiteLoader.scala:48)
        at dotty.tools.scaladoc.site.StaticSiteLoader.load$$anonfun$4(StaticSiteLoader.scala:23)
        at scala.Option.fold(Option.scala:263)
        at dotty.tools.scaladoc.site.StaticSiteLoader.load(StaticSiteLoader.scala:23)
        at dotty.tools.scaladoc.site.StaticSiteContext.staticSiteRoot$lzyINIT1(StaticSiteContext.scala:40)
        at dotty.tools.scaladoc.site.StaticSiteContext.staticSiteRoot(StaticSiteContext.scala:40)
        at dotty.tools.scaladoc.renderers.Renderer.<init>(Renderer.scala:36)
        at dotty.tools.scaladoc.renderers.HtmlRenderer.<init>(HtmlRenderer.scala:10)
        at dotty.tools.scaladoc.Scaladoc$.run(Scaladoc.scala:237)
        at dotty.tools.scaladoc.Scaladoc$.run$$anonfun$1(Scaladoc.scala:68)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
        at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
        at scala.Option.map(Option.scala:242)
        at dotty.tools.scaladoc.Scaladoc$.run(Scaladoc.scala:72)
        at dotty.tools.scaladoc.Main.run(Main.scala:8)
        at dotty.tools.scaladoc.Main$.main(Main.scala:14)
        at dotty.tools.scaladoc.Main.main(Main.scala)

Which I don't fully understand because the classpath that the scaladoc script is putting together does indeed have /Users/ckipp/Documents/scala-workspace/dotty/dist/target/pack/lib/flexmark-ext-tables-0.62.2.jar in it for me locally, which has this class. I'm either doing something wrong, not understanding how the test works, or something. Anyone have any ideas?

[Dedelweiss]

Hello, I have cloned the PR and I will see what is blocking this one. If anyone has any suggestions or has already started something, I'm open to suggestions.

[ckipp01]

Superseded by #17347.