[ci] Update rust in ci image (1.75 and 2024-01-22) (#3016)

cc https://github.com/paritytech/ci_cd/issues/926

---------

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: command-bot <>
Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>
Co-authored-by: Dónal Murray <donal.murray@parity.io>
Co-authored-by: Vladimir Istyufeev <vladimir@parity.io>

substrate/frame/support/test/tests/pallet_ui/pass/error_nested_types.rs

@@ -19,6 +19,7 @@ use codec::{Decode, Encode};
 use frame_support::PalletError;
 
 #[frame_support::pallet]
+#[allow(unused_imports)]
 mod pallet {
 	#[pallet::config]
 	pub trait Config: frame_system::Config {}
@@ -34,25 +35,24 @@ mod pallet {
 
 #[derive(Encode, Decode, PalletError, scale_info::TypeInfo)]
 pub enum MyError {
-    Foo,
-    Bar,
-    Baz(NestedError),
-    Struct(MyStruct),
-    Wrapper(Wrapper),
+	Foo,
+	Bar,
+	Baz(NestedError),
+	Struct(MyStruct),
+	Wrapper(Wrapper),
 }
 
 #[derive(Encode, Decode, PalletError, scale_info::TypeInfo)]
 pub enum NestedError {
-    Quux
+	Quux,
 }
 
 #[derive(Encode, Decode, PalletError, scale_info::TypeInfo)]
 pub struct MyStruct {
-    field: u8,
+	field: u8,
 }
 
 #[derive(Encode, Decode, PalletError, scale_info::TypeInfo)]
 pub struct Wrapper(bool);
 
-fn main() {
-}
+fn main() {}

substrate/frame/support/test/tests/pallet_ui/pass/event_type_bound_system_config_assoc_type.rs

@@ -16,6 +16,7 @@
 // limitations under the License.
 
 #[frame_support::pallet]
+#[allow(unused_imports)]
 mod pallet {
 	use frame_support::pallet_prelude::{Hooks, IsType};
 	use frame_system::pallet_prelude::BlockNumberFor;