fix: GethExecError serialize

[yiweichi]

Description

[PR description]

The Serialize and Deserialize of GethExecError doesn't match, will panic when Deserialize a object of GethExecError that just been Serialized.

Issue Link

[link issue here]

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Contents

• [item]

Rationale

[design decisions and extended information]

How Has This Been Tested?

[explanation]

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Design choices

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