Rollup merge of #127131 - Kobzol:remove-unused-deps, r=compiler-errors

Remove unused `rustc_trait_selection` dependencies

Found using `cargo-machete`. The `bitflags` and `derivative` crates were added for the new trait solver, but weren't removed when the next trait solver code was uplifted to a separate crate.

Cargo.lock

@@ -4760,8 +4760,6 @@ checksum = "8ba09476327c4b70ccefb6180f046ef588c26a24cf5d269a9feba316eb4f029f"
 name = "rustc_trait_selection"
 version = "0.0.0"
 dependencies = [
- "bitflags 2.5.0",
- "derivative",
  "itertools",
  "rustc_ast",
  "rustc_ast_ir",
@@ -4770,7 +4768,6 @@ dependencies = [
  "rustc_errors",
  "rustc_fluent_macro",
  "rustc_hir",
- "rustc_index",
  "rustc_infer",
  "rustc_macros",
  "rustc_middle",
@@ -4783,7 +4780,6 @@ dependencies = [
  "rustc_target",
  "rustc_transmute",
  "rustc_type_ir",
- "rustc_type_ir_macros",
  "smallvec",
  "tracing",
 ]