tests: Remove .py.exp files that match with CPython 3.8.2 or newer.

Running the tests now requires CPython 3.8.2 or newer, which was
released February 2020 and should be widely available.

A few examples of features that were previously not supported by CPython,
but which are now:
- %-formatting for bytes and bytearray (PEP 461), CPython 3.5
- annotated variables (PEP 526), CPython 3.6
- assignment expressions (PEP 572), CPython 3.8

Note that `basics/fun_code_full.py.exp` is added here because that requires
CPython 3.10 or newer.

Signed-off-by: Damien George <damien@micropython.org>

tests/extmod/asyncio_basic.py.exp

@@ -1,6 +0,0 @@
-start
-after sleep
-short
-long
-negative
-took 200 400 0

tests/extmod/asyncio_lock.py.exp

@@ -1,41 +0,0 @@
-False
-True
-False
-have lock
-----
-task start 1
-task start 2
-task start 3
-task have 1 0
-task have 2 0
-task have 3 0
-task have 1 1
-task have 2 1
-task have 3 1
-task have 1 2
-task end 1
-task have 2 2
-task end 2
-task have 3 2
-task end 3
-----
-task have True
-task release False
-task have True
-task release False
-task have again
-task have again
-----
-task got 0
-task release 0
-task cancel 1
-task got 2
-task release 2
-False
-----
-task got 0
-task cancel 1
-task release 0
-task got 2
-task cancel 2
-False

tests/extmod/asyncio_wait_task.py.exp

@@ -1,12 +0,0 @@
-start
-task 1
-task 2
-----
-start
-hello
-world
-took 200 200
-task_raise
-ValueError
-task_raise
-ValueError

tests/extmod/json_loads_bytes.py.exp

@@ -1,2 +0,0 @@
-[1, 2]
-[None]

tests/extmod/re_sub_unmatched.py.exp

@@ -1 +0,0 @@
-1-a2