Update existential_type + impl_trait_in_bindings issue numbers.

Author: Centril

src/libsyntax/feature_gate.rs

@@ -472,7 +472,7 @@ declare_features! (
     (active, doc_alias, "1.27.0", Some(50146), None),
 
     // Allows defining `existential type`s.
-    (active, existential_type, "1.28.0", Some(34511), None),
+    (active, existential_type, "1.28.0", Some(63063), None),
 
     // Allows inconsistent bounds in where clauses.
     (active, trivial_bounds, "1.28.0", Some(48214), None),
@@ -525,7 +525,7 @@ declare_features! (
     (active, bind_by_move_pattern_guards, "1.30.0", Some(15287), None),
 
     // Allows `impl Trait` in bindings (`let`, `const`, `static`).
-    (active, impl_trait_in_bindings, "1.30.0", Some(34511), None),
+    (active, impl_trait_in_bindings, "1.30.0", Some(63065), None),
 
     // Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check.
     (active, lint_reasons, "1.31.0", Some(54503), None),

src/test/ui/existential-type/issue-60371.stderr

@@ -4,7 +4,7 @@ error[E0658]: existential types are unstable
 LL |     existential type Item: Bug;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: for more information, see https://github.com/rust-lang/rust/issues/34511
+   = note: for more information, see https://github.com/rust-lang/rust/issues/63063
    = help: add `#![feature(existential_type)]` to the crate attributes to enable
 
 error[E0277]: the trait bound `(): Bug` is not satisfied

src/test/ui/feature-gates/feature-gate-existential-type.stderr

@@ -4,7 +4,7 @@ error[E0658]: existential types are unstable
 LL | existential type Foo: std::fmt::Debug;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: for more information, see https://github.com/rust-lang/rust/issues/34511
+   = note: for more information, see https://github.com/rust-lang/rust/issues/63063
    = help: add `#![feature(existential_type)]` to the crate attributes to enable
 
 error[E0658]: existential types are unstable
@@ -13,7 +13,7 @@ error[E0658]: existential types are unstable
 LL |     existential type Baa: std::fmt::Debug;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: for more information, see https://github.com/rust-lang/rust/issues/34511
+   = note: for more information, see https://github.com/rust-lang/rust/issues/63063
    = help: add `#![feature(existential_type)]` to the crate attributes to enable
 
 error: aborting due to 2 previous errors