Auto merge of #140180 - ChrisDenton:rollup-5pvs08u, r=ChrisDenton

Rollup of 7 pull requests

Successful merges:

 - #140142 (Some more graphviz tweaks)
 - #140146 (Update `compiler_builtins` to 0.1.156)
 - #140147 (Clean: rename `open_braces` to `open_delimiters` in lexer and move `make_unclosed_delims_error` into `diagnostics.rs`.)
 - #140160 (Use `is_lang_item` and `as_lang_item` instead of handrolling their logic)
 - #140163 (Validate extension in `PathBuf::add_extension`)
 - #140173 (Ping Mara when touching format_args!() internals.)
 - #140175 (`rc""` more clear error message)

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

Author: bors