Rollup merge of rust-lang#131192 - ismailarilik:handle-potential-query-instability-lint-for-rustc-query-impl, r=compiler-errors

Handle `rustc_query_impl` cases of `rustc::potential_query_instability` lint

This PR removes `#![allow(rustc::potential_query_instability)]` line from [`compiler/rustc_query_impl/src/lib.rs`](https://github.com/rust-lang/rust/blob/master/compiler/rustc_query_impl/src/lib.rs#L5) <s>and converts `FxHash{Map,Set}` types into `FxIndex{Map,Set}` to suppress lint errors</s> (was not necessary for this PR).

A somewhat tracking issue: rust-lang#84447

r? ``@compiler-errors``

Author: matthiaskrgr

compiler/rustc_query_impl/src/lib.rs

@@ -2,7 +2,7 @@
 
 // tidy-alphabetical-start
 #![allow(internal_features)]
-#![allow(rustc::potential_query_instability, unused_parens)]
+#![allow(unused_parens)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![doc(rust_logo)]
 #![feature(min_specialization)]