Resolved deprecated default method config

[freemanjp]

@JvmDefault was deprecated in Kotlin 1.6.

[codecov]

Codecov Report

Merging #265 (e385e7f) into master (2ae5465) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master      #265   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       136       136           
===========================================
  Files             70        70           
  Lines            656       656           
  Branches          33        33           
===========================================
  Hits             656       656           

Impacted Files	Coverage Δ
...maven/doxia/sink/kotlin/content/AnchorContainer.kt	100.00% <ø> (ø)
...maven/doxia/sink/kotlin/content/AuthorContainer.kt	100.00% <ø> (ø)
...n/maven/doxia/sink/kotlin/content/BodyContainer.kt	100.00% <ø> (ø)
...aven/doxia/sink/kotlin/content/CommentContainer.kt	100.00% <ø> (ø)
...n/maven/doxia/sink/kotlin/content/DateContainer.kt	100.00% <ø> (ø)
.../doxia/sink/kotlin/content/DefinedTermContainer.kt	100.00% <ø> (ø)
...n/doxia/sink/kotlin/content/DefinitionContainer.kt	100.00% <ø> (ø)
...xia/sink/kotlin/content/DefinitionListContainer.kt	100.00% <ø> (ø)
...sink/kotlin/content/DefinitionListItemContainer.kt	100.00% <ø> (ø)
...oxia/sink/kotlin/content/FigureCaptionContainer.kt	100.00% <ø> (ø)
... and 24 more

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