Upgrade confluent-kafka-go to v1.8.2

[stephen37]

What this PR does / why we need it: We can't use PEM strings for SSL if we don't have that version of confluent-kafka-go

Which issue(s) this PR fixes:

Fixes #3866

Special notes for your reviewer:

[seldondev]

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[seldondev]

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[stephen37]

@cliveseldon Shall we merge that one so that I can add the support for PEM strings? 🙏

[ukclivecox]

@stephen37 Sounds good.