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/ui2/src/components/button/button_like.rs

@@ -199,6 +199,7 @@ impl ButtonStyle {
         }
     }
 
+    #[allow(unused)]
     pub(crate) fn disabled(self, cx: &mut WindowContext) -> ButtonLikeStyles {
         match self {
             ButtonStyle::Filled => ButtonLikeStyles {