Fix false positive update alert when local version is newer

[henriquegeremia]

Description

This PR fixes a bug where the plugin incorrectly alerts the user that an update is available when the locally installed version is actually newer than the latest version fetched from the GitHub API.

Currently, users running a newer local version (e.g., 1.4.0) are prompted with 🚀 Update available! (1.3.7) because the update checking logic in update-checker.cpp only checks for strict equality (info.version == PLUGIN_VERSION). If the versions do not match, it assumes a new update is available.

Solution

1. Introduced a semantic version comparison helper is_newer_version that splits both the remote and local version strings by . and compares the integer components sequentially.
2. Updated the comparison inside the callback of check_update to only set latestVersionForUpdate if the fetched remote version is strictly newer than the currently installed PLUGIN_VERSION.

---

Pull Request Checklist

Please read our latest CONTRIBUTING.md.

• I have read the latest CONTRIBUTING.md.
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[umireon]

Nice catch!

[umireon]

You can use regex. This part is run only once and regex is preferred to stringstream.

[henriquegeremia]

Done! I've updated the implementation to use std::regex instead of std::stringstream. Thanks for the feedback!

[umireon]

Please use the following regex:

^(\d+)\.(\d+)\.(\d+)(?:-([a-zA-Z]+)(?:\.?(\d+))?)?$

Simply ignore the 4th and 5th component.
And please make this PR ready.

[umireon]

You are required to check the Pull Request checklist I've added. Do not remove template.

[henriquegeremia]

Done! I've updated the regex to match the exact pattern you suggested, restored the PR checklist template, and marked the PR as ready for review.

[umireon]

@henriquegeremia Thanks for contribution! Finally, please sign your commits and add DCO! See https://github.com/royshil/obs-backgroundremoval/blob/main/CONTRIBUTING.md#4-developer-certificate-of-origin-dco-and-commit-signing

[umireon]

Stalled. Closing.