core: fix core ut

[zlacfzy]

Description

1. Fix p256Verify precompile test (core/vm/contracts_test.go)

Added missing eip7951: true field to the p256Verify precompile instance in the test's allPrecompiles map to match the expected configuration.

2. Fix number variable type in chain freezer (core/rawdb/chain_freezer.go)

Problem:
The number variable was declared as *uint64 (pointer) but was being used in contexts that expected a value type.

Fix:
Changed number from *uint64 to uint64 and removed the dereference operators (*number) in the subsequent usages.

Rationale

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Example

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Changes

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