Add a couple of linkcheck exceptions:

[marxin]

Addresses:

Server returned 500 Internal Server Error for https://github.com/rust-lang/rust/pulls?q=is%3Apr+label%3AS-inactive+is%3Aclosed
Server returned 401 Unauthorized for https://objects.githubusercontent.com/github-production-release-asset-2e65be/343907537/60cd5880-7b81-11eb-9502-68d5f473ebe2?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=releaseassetproduction%2F20241103%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20241103T085906Z&X-Amz-Expires=300&X-Amz-Signature=e532fd7d2bd271f12988982bc8e5a47a0f966b40452b55d444bbb74292ac1fb1&X-Amz-SignedHeaders=host&response-content-disposition=attachment%3B%20filename%3Drustc.generic.wpaProfile&response-content-type=application%2Foctet-stream
Server returned 500 Internal Server Error for https://github.com/rust-lang/rust/pulls?q=is%3Apr+label%3AS-inactive

[jieyouxu]

I'm not sure about the PR link exceptions, but I also am not sure about the linkcheck in general... so maybe cc @tshepang and @camelid?

[marxin]

I'm not sure about the PR link exceptions, but I also am not sure about the linkcheck in general... so maybe cc @tshepang and @camelid?

Note these are the last missing pieces after which the full link check will become green again. Moreover, with mdbook-linkcheck2, we can also enable checking for modified files (with -f option) and should result in more stable links in the future.