Cannot use annotated expression in filter

[Masynchin]

Describe the bug
I have AttributeError: 'ArithmeticExpression' object has no attribute 'resolve' error when trying to filter models by F expression. I want to filter players who are older than 21 years.

To Reproduce
Model:

class Player(Model):
    id = fields.IntField(pk=True)
    nation = fields.CharField(max_length=32)
    firstname = fields.CharField(max_length=32)
    lastname = fields.CharField(max_length=32)
    fullname = fields.CharField(max_length=64)
    position = fields.CharField(max_length=3)
    skill = fields.SmallIntField()
    birthday = fields.DateField()
    market_value = fields.IntField()

    club = fields.ForeignKeyField(
        "models.Club", related_name="squad", null=True
    )

Query:

import datetime as dt
from tortoise.expressions import F

players = await (
    Player
    .annotate(age = dt.datetime.now() - F("birthday"))
    .filter(age__gt=21)
)

Expected behavior
Expected result is Player instances with ages more than 21

Additional context
Full traceback:

Traceback (most recent call last):
  File "C:\fotbolti\tests\test_search_service\test_search_players.py", line 130, in test_something
    [players], *_ = await search_service.search_players()
  File "C:\fotbolti\fotbolti\search_service.py", line 38, in search_players
    players = await (
  File "c:\users\...\appdata\local\pypoetry\cache\virtualenvs\fotbolti-0qb8cmjl-py3.8\lib\site-packages\tortoise\queryset.py", line 871, in __await__
    self._make_query()
  File "c:\users\...\appdata\local\pypoetry\cache\virtualenvs\fotbolti-0qb8cmjl-py3.8\lib\site-packages\tortoise\queryset.py", line 836, in _make_query
    self.resolve_filters(
  File "c:\users\...\appdata\local\pypoetry\cache\virtualenvs\fotbolti-0qb8cmjl-py3.8\lib\site-packages\tortoise\queryset.py", line 126, in resolve_filters
    modifier &= node.resolve(model, annotations, custom_filters, model._meta.basetable)
  File "c:\users\...\appdata\local\pypoetry\cache\virtualenvs\fotbolti-0qb8cmjl-py3.8\lib\site-packages\tortoise\query_utils.py", line 386, in resolve
    return self._resolve_kwargs(model, table)
  File "c:\users\...\appdata\local\pypoetry\cache\virtualenvs\fotbolti-0qb8cmjl-py3.8\lib\site-packages\tortoise\query_utils.py", line 342, in _resolve_kwargs
    filter_modifier = self._resolve_custom_kwarg(model, key, value, table)
  File "c:\users\...\appdata\local\pypoetry\cache\virtualenvs\fotbolti-0qb8cmjl-py3.8\lib\site-packages\tortoise\query_utils.py", line 284, in _resolve_custom_kwarg
    annotation_info = annotation.resolve(model, table)
AttributeError: 'ArithmeticExpression' object has no attribute 'resolve'

After that error I used manual SQL that actually gave me correct result

from tortoise.transactions import in_transaction

async with in_transaction("default") as tconn:
    res, [row] = await tconn.execute_query("""
        SELECT "nation","fullname","firstname","birthday","position","skill","market_value","club_id","lastname","id",'2021-06-27T04:30:49.584324'-"birthday"
"age"
        FROM "player"
        WHERE '2021-06-27T04:30:49.584324'-"birthday" > 21
    """)
    print(list(row))

[long2ice]

Need to be fixed