Fix plurality mismatch for and in pytest terminal summary

testing/python/collect.py

@@ -1167,7 +1167,7 @@ def test_dont_collect_non_function_callable(testdir):
         [
             "*collected 1 item*",
             "*test_dont_collect_non_function_callable.py:2: *cannot collect 'test_a' because it is not a function*",
-            "*1 passed, 1 warnings in *",
+            "*1 passed, 1 warning in *",
         ]
     )
 

testing/python/fixtures.py

@@ -3081,7 +3081,7 @@ class TestErrors:
             *KeyError*
             *ERROR*teardown*test_2*
             *KeyError*
-            *3 pass*2 error*
+            *3 pass*2 errors*
         """
         )