Bump jobserver and fix non-portable builds

[michaelsproul]

Issue Addressed

Fix broken builds as in: https://github.com/sigp/lighthouse/actions/runs/8809536524/job/24180492013

Closes:

• Docker build failing on x86_64_dev since moving to the c-kzg from crate-io  #5572

Proposed Changes

• The main fix is to bump jobserver from 0.1.30 to 0.1.31 to remove usage of the preadv2 syscall that was broken under Cross: rust-lang/jobserver-rs@66782f5
• This PR also turns off default-features for c-kzg so that it's possible to compile Lighthouse without portable blst. Even though we're switching to portable by default (Only portable builds (binaries) #5615) we may as well unbreak the ability to build non-portable binaries.

[michaelsproul]

Prior to this PR, both make build-x86_64 and make build-x86_64-portable were broken on my machine. With this PR, both work.

[jimmygchen]

LGTM!

[michaelsproul]

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[jimmygchen]

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