Update issue reference for impl_trait_in_bindings feature

The existing issue rust-lang#34511 has been closed and replaced by meta-issue rust-lang#63066.

The concrete part of the new meta-issue for this feature should be rust-lang#63065.

Author: strohel

src/doc/unstable-book/src/language-features/impl-trait-in-bindings.md

@@ -1,8 +1,8 @@
 # `impl_trait_in_bindings`
 
-The tracking issue for this feature is: [#34511]
+The tracking issue for this feature is: [#63065]
 
-[#34511]: https://github.com/rust-lang/rust/issues/34511
+[#63065]: https://github.com/rust-lang/rust/issues/63065
 
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