[clang] [Clang][ASTMatcher] Add `dependentScopeDeclRefExpr` Matcher (PR #120996)

[Nathan Ridge via cfe-commits]

https://github.com/HighCommander4 approved this pull request.

Thanks, LGTM!

I will wait a few days before merging in case anyone else has feedback.

https://github.com/llvm/llvm-project/pull/120996