Update sbt-mdoc to 2.3.8 in series/0.6.x #888

Job	Run time
Validate Steward Config (ubuntu-latest, temurin@11)	19s
Generate coverage report (2.13 JVM only) (ubuntu-latest, 2.13.12, temurin@11)	5m 12s
Build and Test (ubuntu-latest, 2.12, temurin@11, skunkJS)	8m 3s
Generate Site (ubuntu-latest, temurin@11)	4m 4s
Build and Test (ubuntu-latest, 2.12, temurin@11, skunkJVM)	6m 45s
Submit Dependencies	0s
Build and Test (ubuntu-latest, 2.12, temurin@11, skunkNative)	8m 41s
Build and Test (ubuntu-latest, 2.13, temurin@11, skunkJS)	7m 2s
Build and Test (ubuntu-latest, 2.13, temurin@11, skunkJVM)	5m 22s
Build and Test (ubuntu-latest, 2.13, temurin@11, skunkNative)	9m 47s
Build and Test (ubuntu-latest, 3, temurin@11, skunkJS)	7m 14s
Build and Test (ubuntu-latest, 3, temurin@11, skunkJVM)	6m 16s
Build and Test (ubuntu-latest, 3, temurin@11, skunkNative)	8m 59s
Publish Artifacts	0s
	1h 17m 44s

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