Update zio, zio-test, zio-test-sbt to 1.0.0-RC21 (zio#173)

Upgrade ZIO to 1.0.0-RC20 (zio#160)

Upgrade ZIO to 1.0.0-RC19 (zio#151)

* Upgrade ZIO to 1.0.0-RC19

* Improve tests

make OpenTracing.managed public (zio#128)

Update zipkin-reporter, ... to 2.12.2 (zio#113)

Co-authored-by: Simon Schenk <[email protected]>

Upgrade to 1.0.0-RC18 (zio#105)

Update zio-interop-cats to 2.0.0.0-RC8 (zio#35)

Enable 2.13 release (zio#29)

Fix build configuration (zio#17)