Bump kotlin-stdlib from 1.4.0 to 1.6.0 in /composite-kotlin#15

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dependabot/maven/composite-kotlin/org.jetbrains.kotlin-kotlin-stdlib-1.6.0OpenSourceNZ/osnz-java-composite:dependabot/maven/composite-kotlin/org.jetbrains.kotlin-kotlin-stdlib-1.6.0Copy head branch name to clipboard