Auto merge of #124289 - matthiaskrgr:rollup-oxw52jy, r=matthiaskrgr

Rollup of 5 pull requests

Successful merges:

 - #123050 (panic_str only exists for the migration to 2021 panic macros)
 - #124067 (weak lang items are not allowed to be #[track_caller])
 - #124099 (Disallow ambiguous attributes on expressions)
 - #124284 (parser: remove unused(no reads) max_angle_bracket_count field)
 - #124288 (remove `push_trait_bound_inner`)

r? `@ghost`
`@rustbot` modify labels: rollup