Check composer global home for dep binary as well

[SimJoSt]

In the detection of already present Deployer binaries, I would suggest adding the global composer directory as well: https://github.com/deployphp/action/blob/06aeb295d6432970d615c5551e3d941e50349c46/index.js#L62

It can be checked with composer -n config --global home.

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