Remove bytes keys from tests (#9017)

Author: jacobtomlinson

distributed/http/scheduler/tests/test_scheduler_http.py

@@ -571,8 +571,6 @@ async def test_sitemap(s, a, b):
     "[",
     "'",
     '"',
-    b"123",
-    (b"123", 1),
     ("[", 1),
     ("(", 1),
     ("'", 1),

distributed/tests/test_client.py

@@ -5412,17 +5412,6 @@ def test_dynamic_workloads_sync_random(c):
     assert future.result(timeout=20) == 52
 
 
-@gen_cluster(client=True)
-async def test_bytes_keys(c, s, a, b):
-    key = b"inc-123"
-    future = c.submit(inc, 1, key=key)
-    result = await future
-    assert type(future.key) is bytes
-    assert set(s.tasks) == {key}
-    assert key in a.data or key in b.data
-    assert result == 2
-
-
 @gen_cluster(client=True)
 async def test_unicode_ascii_keys(c, s, a, b):
     uni_type = str