Upgrade Rust to 1.75

components/support/error/tests/returns_not_result.stderr

@@ -9,3 +9,7 @@ error[E0308]: mismatched types
    = note: expected struct `String`
                 found enum `Result<String, ExternalError>`
    = note: this error originates in the attribute macro `handle_error` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider using `Result::expect` to unwrap the `Result<String, ExternalError>` value, panicking if the value is a `Result::Err`
+   |
+39 |  #[handle_error(Error)].expect("REASON")
+   |                        +++++++++++++++++

components/support/error/tests/returns_result_but_incorrect_error.stderr

@@ -9,3 +9,7 @@ error[E0308]: mismatched types
    = note: expected enum `std::result::Result<String, ExternalError>`
               found enum `std::result::Result<_, OtherExternalError>`
    = note: this error originates in the attribute macro `handle_error` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: use the `?` operator to extract the `std::result::Result<_, OtherExternalError>` value, propagating a `Result::Err` value to the caller
+   |
+50 |  #[handle_error(Error)]?
+   |                        +

rust-toolchain.toml

@@ -7,7 +7,7 @@
 #   supported and used in CI.
 
 [toolchain]
-channel = "1.74.0"
+channel = "1.75.0"
 targets = [
     "aarch64-linux-android",
     "armv7-linux-androideabi",