Do not run CI tests under MacOS

Sergej Kostjucenko requested to merge cmichi-debug-failing-macos into master

Created by: cmichi

I've removed running the CI tests on MacOS, since those tests are not needed to be run under MacOS as well. We already test if the ink! examples can be built and tested with cargo-contract's master in https://github.com/paritytech/ink/blob/master/.github/workflows/examples.yml.

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