[python] upgrade dependencies for http-client-python

[Copilot]

This PR upgrades the dependencies for the @typespec/http-client-python package as requested in the issue.

Changes Made

• Upgraded dependency: @azure-tools/typespec-client-generator-core from ~0.57.0 to ~0.57.1
• Updated package-lock.json with the new dependency version
• Added changelog entry with change kind "dependencies" and message "bump typespec"

Process Followed

1. Navigated to packages/http-client-python directory
2. Installed npm-check-updates globally
3. Ran npx npm-check-updates -u --filter @typespec/*,@azure-tools/* to check for updates
4. Executed npm install to install the updated dependencies
5. Verified TypeScript compilation works with npm run build (compilation successful)
6. Added appropriate changelog entry using the chronus change management system

Verification

• The TypeScript build completed successfully, confirming compatibility with the updated dependencies
• Only minimal changes were made (1 line in package.json, corresponding updates in package-lock.json)
• The upgrade was a patch version bump, indicating backward compatibility

Fixes #7610.

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