fix(test-specs): use integer division for genesis base fee

[cuiweixie]

Description

When deriving the genesis base_fee_per_gas from a state test's block#1 env (* 8 / 7), the previous code used float division (/ → float), then cast back with int(...).

IEEE-754 float64 only has a 53-bit mantissa, so integers larger than 2^53 are not represented exactly. For large base_fee_per_gas values this can silently round before the integer conversion, producing an incorrect genesis base fee.

This change switches to pure integer arithmetic (* 8 // 7) so the scaling stays exact for arbitrary-size integers.

Related Issues or PRs

N/A.

Checklist

• Ran fast static checks to avoid CI fails, see Code Standards & Verifying Changes: just static
• PR title has the form <type>(<area>): <title>, where <type> and <area> come from an appropriate C-<type>, respectively A-<area>, label. The title should match the target squash commit message.

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