Bump Rust to 1.75 (#3815)

**This PR also bumps wasmtime version from 0.38 to 2.0 as 0.38 does not
build with Rust 1.75**. I did not test the plugin runtime as (AFAIK) we
intend to deprecate it; also, wasmtime's most recent version is 16.0, so
it'd make sense to bump the version at some point anyways. I did not
bump the version to 16.0 straight away as that'd require code changes in
`plugin_runtime`.
Release Notes:

- N/A

crates/language/src/buffer.rs

@@ -2,7 +2,7 @@ pub use crate::{
     diagnostic_set::DiagnosticSet,
     highlight_map::{HighlightId, HighlightMap},
     markdown::ParsedMarkdown,
-    proto, BracketPair, Grammar, Language, LanguageConfig, LanguageRegistry, PLAIN_TEXT,
+    proto, Grammar, Language, LanguageRegistry,
 };
 use crate::{
     diagnostic_set::{DiagnosticEntry, DiagnosticGroup},