[clang] [Clang][Sema] Make UnresolvedLookupExprs in class scope explicit specializations instantiation dependent (PR #100392)

[via cfe-commits]

cor3ntin wrote:

- Can we get rid of the whitespace only changes?
- Can we maybe introduce an enum, it's a lot of booleans that will be easy to mix. Maybe passing `ExprDependence` would be reasonable here

https://github.com/llvm/llvm-project/pull/100392