Update fs2-core, fs2-io to 3.9.0 in series/0.6.x #831

Job	Run time
Generate Site (ubuntu-latest, temurin@11)	4m 5s
Build and Test (ubuntu-latest, 2.12, temurin@11, skunkJS)	7m 8s
Build and Test (ubuntu-latest, 2.12, temurin@11, skunkJVM)	5m 31s
Build and Test (ubuntu-latest, 2.12, temurin@11, skunkNative)	7m 52s
Build and Test (ubuntu-latest, 2.13, temurin@11, skunkJS)	7m 35s
Build and Test (ubuntu-latest, 2.13, temurin@11, skunkJVM)	6m 17s
Build and Test (ubuntu-latest, 2.13, temurin@11, skunkNative)	10m 7s
Build and Test (ubuntu-latest, 3, temurin@11, skunkJS)	8m 25s
Build and Test (ubuntu-latest, 3, temurin@11, skunkJVM)	5m 12s
Build and Test (ubuntu-latest, 3, temurin@11, skunkNative)	8m 25s
Submit Dependencies	0s
Generate coverage report (2.13 JVM only) (ubuntu-latest, 2.13.11, temurin@11)	4m 1s
Validate Steward Config (ubuntu-latest, temurin@11)	14s
Publish Artifacts	0s
	1h 14m 52s

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