fix(ast-spec): change MemberExpression.object to Expression

[JoshuaKGoldberg]

BREAKING CHANGE:
Switches the AST type for MemberExpression's object property

PR Checklist

• Addresses an existing open issue: fixes Bug: MemberExpression.object should be Expression, not LeftHandSideExpression #6192
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Switches the AST type for MemberExpression's object property from LeftHandSideExpression to Expression.

[typescript-eslint]

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[JoshuaKGoldberg]

Closing in lieu of #6257.