Update plugin dokka to v1.9.20

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This PR contains the following updates:

Package	Change	Age	Confidence
org.jetbrains.dokka	1.9.10 -> 1.9.20

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Release Notes

Kotlin/dokka (org.jetbrains.dokka)

v1.9.20: 1.9.20

General bugfixes

• Fixed sealed interfaces not having the sealed keyword in signatures (#​2994)
• Fixed incorrect links in multi-module projects with non-unique package names (#​2272). Huge thanks to @​EddieRingle!
• Fixed member extensions not being shown on index pages in certain scenarios (#​3187)
• Fixed Java's inner classes not having the inner keyword in Kotlin signatures (#​2793)
• Fixed Java's @param tag not working with type parameters (#​3199)
• Fixed Dokka failing in KMP projects when the JVM source set is suppressed (#​3209)

HTML format

• Provide an ability to add a custom homepage link to the header, more details in #​2948 (comment)
• Fixed tab selection resetting after navigating to a different page (#​2899)
• Fixed inline code not always being aligned with the surrounding text (#​3228)
• Fixed the "No options found" text in search being barely visible (#​3281)
• Fixed empty HTML tags being rendered for no reason (#​3343, #​3095)

Runners

Gradle Plugin

• Mark tasks as not compatible with Gradle configuration cache, second try (#​3438). Thanks to @​3flex for noticing and fixing the problem!

Maven Plugin

• Fixed dokka:help being absent (#​3035). Thanks to @​aSemy!
• Fixed the source links configuration not working (#​3046). Thanks to @​freya022 for fixing this one!

CLI runner

• Allow using relative paths in the sourceRoots configuration option (#​2571)

Plugin API

• Provide an extension point to customize the rendering of code blocks in HTML format (#​3244)

Other:

• Make sure wasm-js and wasm-wasi targets introduced in Kotlin 1.9.20 are supported (#​3310)
• Avoid concurrent invocations of Kotlin compiler's API due to the compiler API itself not always being thread safe (#​3151). No noticeable performance loss is expected.
• Bump dependencies to the latest versions (#​3231, #​3206, #​3204)
• Fix a documentation link (#​3213). Thanks to @​SubhrajyotiSen for noticing and fixing it!
• Various build and project structure improvements (#​3174, #​3132). Enormous thanks to @​aSemy for the help!

See Dokka 1.9.20 milestone for the list of all changes.

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