Update example/hashmaps/example_hashmaps_abstract_type.f90

Co-authored-by: Jeremie Vandenplas <[email protected]>

Author: chuckyvt

example/hashmaps/example_hashmaps_abstract_type.f90

@@ -3,7 +3,6 @@
 ! This allows the procedure to be used for both chaining and open hashmap types.
 
 program example_abstract_type
-    use stdlib_kinds, only: int8, int64
     use stdlib_hashmaps, only: chaining_hashmap_type, open_hashmap_type, hashmap_type
 
     implicit none