Update Go dependencies

[a-akimov]

Motivation and Context

Update versions for Go server and client.

How Has This Been Tested?

Locally

Breaking Changes

N/a

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

N/a

[Copilot]

Copilot review overview

🟢 Approval recommended

The dependency metadata and corresponding client API adjustment are consistent.

Review effort: Balanced
Findings: None

What changed in this PR

Updates Go client and server dependencies while adapting the client to the upgraded Anthropic SDK.

Changes:

• Upgrade MCP Go SDK to v1.8.0.
• Upgrade Anthropic SDK to v1.74.0 and use its model constant.

File	Description
weather-server-go/​go.sum	Updates MCP SDK checksums.
weather-server-go/​go.mod	Upgrades the MCP SDK dependency.
mcp-client-go/​main.go	Uses the Anthropic SDK model constant.
mcp-client-go/​go.sum	Updates direct and transitive dependency checksums.
mcp-client-go/​go.mod	Upgrades dependencies and records new transitive modules.

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