Auto merge of rust-lang#145909 - weihanglo:update-cargo, r=weihanglo

Update cargo submodule

3 commits in 623d536836b4cde09ce38609232a024d5b25da81..a6c58d43051d01d83f55a3e61ef5f5b2b0dd6bd9
2025-08-22 19:05:52 +0000 to 2025-08-26 23:05:12 +0000
- test: avoid hardcoded target spec json (rust-lang/cargo#15880)
- test(add): Cover some frontmatter corner cases (rust-lang/cargo#15886)
- Add more context to publish-failed error message (rust-lang/cargo#15879)

r? ghost

Author: bors