feat: allow wider range of valgrind codspeed version usage

[art049]

Makes it possible to use newer builds of valgrind codspeed with an older runner

[not-matthias]

LGTM!

[Copilot]

Pull Request Overview

This PR updates the valgrind version checking logic to allow the runner to work with newer versions of valgrind-codspeed, rather than requiring an exact version match. The implementation uses semantic versioning to ensure backward compatibility while warning about experimental newer versions.

Key Changes:

• Replaced string-based version checking with semantic version comparison using the semver crate
• Changed version check from exact match to minimum version requirement
• Added version parsing logic that handles various valgrind version string formats

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/run/runner/valgrind/setup.rs	Implements semantic version parsing and comparison logic for valgrind versions, replacing exact string matching with minimum version requirements
src/main.rs	Converts valgrind version constants from strings to semver Version type and introduces separate display string
Cargo.toml	Adds semver dependency for semantic version handling

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