Upgrade to dnsmasq v2.90

[DamianSawicki]

The new dnsmasq version is officially released. Among other things, it

• enables increasing the number of concurrent TCP connections, previously hardcoded as 20,
• fixes the bug causing memory leaks for records with TTL=0.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
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[DamianSawicki]

/ok-to-test

[DamianSawicki]

/cc wewark
/cc tangenti

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[kl52752]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DamianSawicki, kl52752

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[aojea]

do we want to use a larger number of concurrent tcp connections by default?

[bowei]

Can we do a small experiment to understand if we can raise it further (TCP)

[DamianSawicki]

do we want to use a larger number of concurrent tcp connections by default?

My plan is to first only upgrade the image here (no behaviour change). IIUC, all flags for dnsmasq are set internally, and OSS dnsmasq-nanny just passes them, so let's move the discussion to internal channels.