Bump shrink_to stabilization to Rust 1.56

library/std/src/collections/hash/map.rs

@@ -677,7 +677,7 @@ pub fn shrink_to_fit(&mut self) {
     /// assert!(map.capacity() >= 2);
     /// ```
     #[inline]
-    #[stable(feature = "shrink_to", since = "1.55.0")]
+    #[stable(feature = "shrink_to", since = "1.56.0")]
     pub fn shrink_to(&mut self, min_capacity: usize) {
         self.base.shrink_to(min_capacity);
     }

library/std/src/collections/hash/set.rs

@@ -478,7 +478,7 @@ pub fn shrink_to_fit(&mut self) {
     /// assert!(set.capacity() >= 2);
     /// ```
     #[inline]
-    #[stable(feature = "shrink_to", since = "1.55.0")]
+    #[stable(feature = "shrink_to", since = "1.56.0")]
     pub fn shrink_to(&mut self, min_capacity: usize) {
         self.base.shrink_to(min_capacity)
     }

library/std/src/ffi/os_str.rs

@@ -332,7 +332,7 @@ pub fn shrink_to_fit(&mut self) {
     /// assert!(s.capacity() >= 3);
     /// ```
     #[inline]
-    #[stable(feature = "shrink_to", since = "1.55.0")]
+    #[stable(feature = "shrink_to", since = "1.56.0")]
     pub fn shrink_to(&mut self, min_capacity: usize) {
         self.inner.shrink_to(min_capacity)
     }

library/std/src/path.rs

@@ -1398,7 +1398,7 @@ pub fn shrink_to_fit(&mut self) {
     /// Invokes [`shrink_to`] on the underlying instance of [`OsString`].
     ///
     /// [`shrink_to`]: OsString::shrink_to
-    #[stable(feature = "shrink_to", since = "1.55.0")]
+    #[stable(feature = "shrink_to", since = "1.56.0")]
     #[inline]
     pub fn shrink_to(&mut self, min_capacity: usize) {
         self.inner.shrink_to(min_capacity)