[clang-tools-extra] [clang-tidy] Improve `container-data-pointer` check to use `c_str()` (PR #71304)

[Eli Black via cfe-commits]

neoncube2 wrote:

@5chmidti Ah, no, I no longer plan to work on this, sorry. It turns out that C++ compilers are too far out of the range of my experience, haha.

Should I close this pull request? Or if someone wants to use my branch as a base for a new PR, feel free! :)

https://github.com/llvm/llvm-project/pull/71304