go.mod: bump btclog v2 version

[ellemouton]

Depends on btcsuite/btclog#24
Fixes #10084
Replaces #10085

[gemini-code-assist]

Summary of Changes

Hello @ellemouton, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the btclog/v2 dependency to incorporate a critical bug fix related to logger inheritance. The change ensures that child loggers correctly inherit log level changes from their parents, providing consistent logging behavior across the application. This update currently points to a temporary fork while the upstream fix is being finalized.

Highlights

• Dependency Update: I've updated the btclog/v2 dependency by adding a replace directive in go.mod. This temporarily points to a specific commit (v2.0.0-20250723091135-8ba02441ee29) in the author's fork (github.com/ellemouton/btclog/v2) to incorporate a critical bug fix before it's officially released upstream.
• Bug Fix: This PR addresses a bug where child loggers, when created using WithPrefix, did not correctly inherit log level changes from their parent loggers. The updated btclog/v2 version contains the fix to ensure proper log level propagation.
• Documentation: I've added a new entry to the release-notes-0.20.0.md file, documenting the fix for the logger inheritance issue, ensuring it's captured in the upcoming release notes.

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[gemini-code-assist]

Code Review

This pull request bumps the btclog/v2 version and includes a fix for a bug related to child logger inheritance. The changes involve modifications to go.mod, go.sum, and release notes. It's important to verify the compatibility and security implications of the btclog/v2 version bump, and also to ensure that the line length in the release notes does not exceed 80 characters.

[guggero]

Needs a rebase, otherwise LGTM 🎉
Thanks for the fix 🚀

[Roasbeef]

LGTM 🪭