Merge pull request #12378 from Pierre-Sassoulas/fix-implicit-str-concat-and-discovered-bug-due-to-it (#14282)

Fix bug discovered due to the change in  ``implicit-str-concat``

(cherry picked from commit 55560d9)

Co-authored-by: 🇺🇦 Sviatoslav Sydorenko (Святослав Сидоренко) <webknjaz@redhat.com>

Author: patchback[bot]

src/_pytest/_py/path.py

@@ -137,7 +137,7 @@ class NeverRaised(Exception):
 
 class Visitor:
     def __init__(self, fil, rec, ignore, bf, sort):
-        if isinstance(fil, str):
+        if isinstance(fil, (str, bytes)):
             fil = FNMatcher(fil)
         if isinstance(rec, str):
             self.rec: Callable[[LocalPath], bool] = FNMatcher(rec)