Land the Fallout entry in thangchung/awesome-dotnet-core

### Problem

thangchung/awesome-dotnet-core#937 (issue) and thangchung/awesome-dotnet-core#938 (pull request) propose replacing the NUKE entry with Fallout. Both have been open since 2026-07-01. The only reply is an automated CodeRabbit summary.

The list has roughly 21300 stars, so the reach is worth having. The maintainer has merged nothing since 2024-08-26 and has 183 pull requests open.

### Outcome

Either the entry is merged, or this list is written off and the parent issue records why.

### Acceptance criteria

- [ ] thangchung/awesome-dotnet-core#938 is merged, or the list is moved to the skip list in #599 with the reason.

### Notes

Two years without a merge means this is probably unreachable. Worth one polite bump before writing it off.

Part of #599.