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

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

By the way, in case you're interested in doing another one, I filed https://github.com/llvm/llvm-project/issues/121240 about another missing matcher I came across.

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