Update Go version requirement in mcpcurl to 1.24

[alexandear]

Summary

Updates the Go version requirement in mcpcurl documentation from 1.21 to 1.24 to align with the project's actual requirement specified in go.mod.

Why

The mcpcurl documentation stated Go 1.21 as a prerequisite, but the project requires Go 1.24.0+ according to go.mod. This fixes the documentation inconsistency.

What changed

• Updated mcpcurl README to require Go 1.24 instead of 1.21

MCP impact

• No tool or API changes
  Documentation-only change, no impact on MCP tools or server behavior.

Prompts tested (tool changes only)

N/A - documentation change only

Security / limits

• No security or limits impact
  Documentation-only change.

Tool renaming

• I am not renaming tools as part of this PR

Lint & tests

• Linted locally with ./script/lint
• Tested locally with ./script/test

Docs

• Updated (README / docs / examples)
  Updated mcpcurl README.md with correct Go version requirement.

[Copilot]

Pull request overview

This PR fixes a documentation inconsistency by updating the Go version requirement in the mcpcurl README from 1.21 to 1.24, aligning it with the actual requirement specified in go.mod.

Changes:

• Updated Go version prerequisite in mcpcurl documentation from 1.21 to 1.24