Update expected outputs for rustc 1.77 release (#42)

Author: dcchut

tests/ui/arg_not_sync.stderr

@@ -6,7 +6,7 @@ error[E0277]: `dyn Future<Output = ()> + Send` cannot be shared between threads
    |     |
    |     required by a bound introduced by this call
    |
-   = help: the trait `Sync` is not implemented for `dyn Future<Output = ()> + Send`
+   = help: the trait `Sync` is not implemented for `dyn Future<Output = ()> + Send`, which is required by `Pin<Box<dyn Future<Output = ()> + Send>>: Sync`
    = note: required for `Unique<dyn Future<Output = ()> + Send>` to implement `Sync`
 note: required because it appears within the type `Box<dyn Future<Output = ()> + Send>`
   --> $RUST/alloc/src/boxed.rs
@@ -16,7 +16,7 @@ note: required because it appears within the type `Box<dyn Future<Output = ()> +
 note: required because it appears within the type `Pin<Box<dyn Future<Output = ()> + Send>>`
   --> $RUST/core/src/pin.rs
    |
-   | pub struct Pin<P> {
+   | pub struct Pin<Ptr> {
    |            ^^^
 note: required by a bound in `assert_is_sync`
   --> tests/ui/arg_not_sync.rs:3:27
@@ -32,7 +32,7 @@ error[E0277]: `dyn Future<Output = ()>` cannot be shared between threads safely
    |     |
    |     required by a bound introduced by this call
    |
-   = help: the trait `Sync` is not implemented for `dyn Future<Output = ()>`
+   = help: the trait `Sync` is not implemented for `dyn Future<Output = ()>`, which is required by `Pin<Box<dyn Future<Output = ()>>>: Sync`
    = note: required for `Unique<dyn Future<Output = ()>>` to implement `Sync`
 note: required because it appears within the type `Box<dyn Future<Output = ()>>`
   --> $RUST/alloc/src/boxed.rs
@@ -42,7 +42,7 @@ note: required because it appears within the type `Box<dyn Future<Output = ()>>`
 note: required because it appears within the type `Pin<Box<dyn Future<Output = ()>>>`
   --> $RUST/core/src/pin.rs
    |
-   | pub struct Pin<P> {
+   | pub struct Pin<Ptr> {
    |            ^^^
 note: required by a bound in `assert_is_sync`
   --> tests/ui/arg_not_sync.rs:3:27