fix!: update GoogleMLKit pods to version 6.0.0 on iOS

[robingenz]

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Close #178

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Attention: This PR contains a breaking change (see here) and will therefore only be released with version 7.0.0. Until then, however, the following pre-release can be used: https://github.com/capawesome-team/capacitor-mlkit/runs/29350483198

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@capacitor-mlkit/barcode-scanning

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@capacitor-mlkit/face-detection

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commit: bac81ad