test: use toStrictEqual instead of toEqual in InMemoryTransport tests

[starfish719]

Motivation and Context

• Replace toEqual with toStrictEqual for more precise type checking in InMemoryTransport test assertions
• Improves test accuracy by ensuring strict equality checks
  • https://vitest.dev/api/expect.html#tostrictequal

How Has This Been Tested?

• Run existing tests to verify behavior remains correct

Breaking Changes

• none

Types of changes

• 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 change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/sdk@1196 

commit: 70501b4