Update rustc version that or_insert_with_key landed

Author: ChaiTRex

library/alloc/src/collections/btree/map/entry.rs

@@ -132,7 +132,7 @@ impl<'a, K: Ord, V> Entry<'a, K, V> {
     /// assert_eq!(map["poneyland"], 9);
     /// ```
     #[inline]
-    #[stable(feature = "or_insert_with_key", since = "1.49.0")]
+    #[stable(feature = "or_insert_with_key", since = "1.50.0")]
     pub fn or_insert_with_key<F: FnOnce(&K) -> V>(self, default: F) -> &'a mut V {
         match self {
             Occupied(entry) => entry.into_mut(),

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

@@ -2238,7 +2238,7 @@ impl<'a, K, V> Entry<'a, K, V> {
     /// assert_eq!(map["poneyland"], 9);
     /// ```
     #[inline]
-    #[stable(feature = "or_insert_with_key", since = "1.49.0")]
+    #[stable(feature = "or_insert_with_key", since = "1.50.0")]
     pub fn or_insert_with_key<F: FnOnce(&K) -> V>(self, default: F) -> &'a mut V {
         match self {
             Occupied(entry) => entry.into_mut(),