Update rdkafka version and fix lint warning

[FalkWoldmann]

...you know the drill ;)

See #257

[FalkWoldmann]

Hmm, I guess we need to include curl in the CI/CD? We could also link curl statically, which should work OOTB and should be less headache for the users

[Lazzaretti]

Hmm, I guess we need to include curl in the CI/CD? We could also link curl statically, which should work OOTB and should be less headache for the users

Thanks for your PR and for pointing out the problem! I've added a quick fix to pin rdkafka-sys to <4.10 for now: #268 The root cause is an upstream librdkafka issue where curl.h is included unconditionally even when WITH_CURL=0. There's a fix pending:

• rust-rdkafka tracking issue: rdkafka-sys-4.10.0 depends on curl even without curl feature flag fede1024/rust-rdkafka#829
• Upstream fix (approved but not merged): Fix build with WITH_OAUTHBEARER_OIDC=0 confluentinc/librdkafka#5230

I'd prefer to wait for the upstream fix rather than adding curl as a CI dependency or linking it statically, since that would add an unnecessary dependency for users who don't need OIDC/OAuth features. Once rdkafka-sys releases a fixed version, we can bump the constraint.

What do you think @FalkWoldmann is this fine for you?