fix(gas-limiter): correct bucket cleanup condition

[Bilogweb3]

The garbage collection in AddressGasLimiter never removed any buckets because the retain condition bucket.available <= bucket.capacity was always true after the refill operation (which uses min(capacity, available + refill_rate)).

Changed condition from <= to < so that fully refilled buckets (available == capacity) are properly removed during cleanup intervals.

[cb-heimdall]

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[haardikk21]

We do not use the gas limiter on Base and it is on track to be deleted from this codebase. I'm going to close this PR as it doesn't pertain to an issue we're attempting to solve.